I would argue that if Florida wins out their regular season and LSU wins out their regular season. Those 2 teams play in the SEC Championship and Florida wins that both LSU and Florida should be in the Playoff.
The SEC East may not be strong this year but it is still significantly stronger than the Big Ten West.
I would argue that with the small number of non-conference games, and particularly the small number of games between power 5 conference teams, its impossible to adequately compare one conference to another. For that reason, if you truly want to determine the national champion on the field, you should NEVER have 2 teams from the same conference in a 4 team playoff.