It's certainly not the Big Ten.
The SEC defenses aren't quite where they were at peak SEC, and so a little more is falling on the offenses, and I think that is exposing the lack of QB depth, particualrly as compared to the ACC. I was trying to think of how many SEC starting QBs from last year I could name off the top of my head, and the only two I could were Hurts and Kelly. I know Florida and LSU were starting former Purdue backup QBs at times.
Just naming the elite QBs the ACC had (has) Jackson, Trubisky, Watson, hell, even Nathan Peterman got drafted.
not being able to name them doesn't mean they are bad. sec actually has some good qb's this year.
allen (ark) and lock(mizz) both threw for 3400 and ~25 tds last year.
uga's eason is thought to be one of the better young qb's in nation and had a pretty good frosh campaign.
au has stidham, who's touted at pretty good and looked good in his short bigxii stint.
msu's fitzgerald is a dynamic running qb (1375 r/y and 16 r/td, plus 2400 p/y and 21 p/td).
even ole miss has a good looking qb in patterson.
and uk, vandy, lsu, and usc all have returning starters, though none were spectacular.
tenn, uf and aTm are the only ones starting completely over i think. and uf has zaire, who was at least decent at nd as backup.
obviously not all of those will have amazing years. but i do think this year will feature a good crop of qb's from sec. the foundation is there for that, anyway.
having said that, all conf have ugly spots going into season. b1g had bad bowl season, acc lost a ridiculous amount and there's an unknown of who's up top, sec is looking like bama and the rest for last few seasons with no apparent change. bigxii just doesn't have it and pac doesn't look like it does either.
not convinced any conf will be able to differentiate from the rest.