Warning: long and nerdy.
I use all, plus some notes here regarding the Cloud:
Chrome: primary browser, mega-bookmarks, like the clean interface, good with the database utility Zotero, use for CF (more so than IE or FF)
IE: currently minimal, but increasing (in general for Word on SkyDrive, not so much for CF) *
Firefox: increasing rapidly versus Chrome, best for Zotero ** (links below at bottom), which includes a standalone database just recently and with a Cloud component, no longer just a Firefox extension = might eliminate filing cabinets of material. Plus, massively improved FF interface over the last year. From my standpoint, the FF improvement is probably related to Zotero, with people otherwise more inclined to switch to Chrome (and therefore use Zotero less). Or otherwise just unhappy with FF, using it only because of this legacy extension. Both FF and Zotero folks had to know this. Using Chrome as my primary/personal use browser helps focus FF bookmarks more on work/academic stuff.
Safari: iPad, use for CF
Android: Cell phone, use for CF (not the mobile app)
Maybe about an even split for CF: Chrome, Safari, Android (but some FF and IE, probably more in the future)
**********
*IE increasing based on new products and recent experimentation.
This is based on my own resources and needs, so others will have their own preferences.
IE is best for writing and revising Word docs on SkyDrive (Cloud). Google just came out with Google Drive, making it possibly a superior product, and I use Google Docs a lot (with the improvements now called Drive). I was inclined to use Google Drive even more when it came out last week, but I am instead going to use primarily Word for now, based on my experimentation. You can use other browsers with Word on SkyDrive, but some aspects are better integrated on IE (e.g., cut and paste).
Most important factor: the new SkyDrive app for the iPad.
What I really like about this is that it does an excellent job with pdfs (like academic papers), so all the ones I’ve stored in the SkyDrive (Cloud) for free - that I copied there for long-term backup - show up quite nicely on the iPad without adding to the iPad, for example, to iBooks. Wow! I was just putting them there for backup. Papers like this I might have in Zotero in the future (instead or in addition to). But it was like having hundreds of documents in a storage locker somewhere suddenly at my fingertips - and on a tablet, not a bulky desktop.
Plus, these are important (to me) or I wouldn’t have copied them to SkyDrive to begin with.
Similar to the pdfs, by storing Word docs in SkyDrive, your personally produced Word documents show up on your iPad automatically (again, via the iPad SkyDrive app).
My preference for using IE and Word versus Google Docs relates to both formatting, how my personally produced documents show up on the iPad via SkyDrive, and administrative tasks involved like moving documents around - moving documents from Google Drive to SkyDrive (versus simply creating them there directly). I expect that both Google and Microsoft will probably improve the formatting compatibilities, and transfer (though transferring is surprisingly easy and quick). I experimented a lot this weekend, and consider the format important: (1) to get it right to begin with, (2) since your own docs on the iPad can look professionally produced, or least adequate (similar effect to having a good website, versus crap), (3) much of this writing might never need to be printed.
This can make the iPad like a tablet of paper with my own notes, and effectively an unlimited number of pages.
For me, this isn't so much for modifying those Word documents on the iPad, but just having them at my fingertips. For students, this could mean ready access to class notes.
Again, it is like being able to view things at your fingertips on a tablet that might otherwise be filed away in a filing cabinet, far away and out of sight. And not just that, a huge amount.
Other aspects I will not get into detail (Apple’s iCloud), and as I said above, other’s experiences will vary.
It is possible though to type a document in Apple's Pages word processor on the iPad and get it to SkyDrive fairly easily (via iCloud), but like Google Drive, slightly more roundabout than doing this directly with Word. Or using Apple exclusively probably has certain advantages (and might even be superior from what I can tell). Various tradeoffs exist depending on any number of factors, including not just what hardware you use, but where you do your work, and whether you always have an internet connection. The reason I put a bunch of stuff on SkyDrive to begin with was a huge amount of free storage available through Microsoft.
Similar to Firefox and Zotero, using IE almost exclusively for Word on SkyDrive helps keep fewer bookmarks and me better focused. Of course I should probably only bookmark two, SkyDrive and CF.
On a final note, Google has yet to produce its Google Drive app for the iPad (or the Mac, I believe). So it will presumably want it to be comparable to or better than the SkyDrive app. If it is, I might readily start using Google Drive more for documents, in addition or instead of Word. Both offer a fair amount of free storage (but my free storage at Microsoft is huge).
Zotero
** My Firefox use is increasing a lot due to better FF interface, and FF works best with Zotero.
On Zotero, I’ve been experimenting just a little for about a year. But I am using it a ton now that they have standalone and a Cloud component (again, no longer just a Firefox extension). Many more things make sense now that didn’t two months ago. You can really tie all these things together - Cloud, filing/bookmarking web pages, documents, newspaper articles etc. - especially now that Firefox has improved. Firefox is still best for Zotero, though Chrome is also good. IE apparently will never be, as it is not open source, though you can access your Zotero Cloud database with any browser.
On the Cloud, a copy of your local database is automatically synced, so you can view your Zotero database and files from any computer with an internet connection (plus that is like a backup). Zotero as an application has always been free, and still is. With the Cloud though, once you go above a certain amount now, you have to pay for storage with Zotero. But to me it appears it may be worth it. It is very powerful, a database tool, a superior tool for both filing and retrieving information.
I’d encourage everyone to check Zotero out, even for newspaper articles, product reviews or what not, anything you might want to save. It takes awhile to learn, and I still am. But it is simple to begin, simple to use, and easier with experience.
I don't know, but possibly most would never store enough to have to pay.
IMO almost any college student should, and many others here could benefit.
https://www.zotero.org/
quick_start_guide [Zotero Documentation]