forgot about the company HSA contribution. That would push it to $60 difference.
I'll just use myself as an example. The 2017 HSA contribution limits for a family is $6750. My employer puts in $1200, so I can put in up to $5550 of my own money. Conservatively, if I assume a 15% tax rate, that saves me $832.50 a year in taxes. So, even though the HSA has a higher deductible and OOPM, it has lower premiums (I save $572/yr in premiums), plus $1200 HSA money, plus $832.50 in tax savings assuming I max it out.
All those benefits add up to about $2600 in funds that I have because I went with the HSA plan. The HSA plan has a deductible that is $900 higher and an OOPM that is $2,000 higher. Based on my math, the HSA works for me. At worst, if I max out through in a given year, I'm only $300 behind the other plan.
Again, not saying the HSA is the way to go for everyone. This is just the exercise I went through to decide. I haven't looked into it much, but my expectation is that HSAs are somehow better for the employer than "traditional plans" so they seem to incentivize the HSA plan.