Yes the NFC is stronger, more specifically, the NFC EAST is the strongest.
All four teams in the division know the stakes and know that at most only three of them can make the playoffs (which isn't realistic) so they draft, trade, and train preparing to beat the hell out of one another.
Any one of the four could win it all this year, IMO.
As for the rest of the NFC, I think only maybe the Panthers could make it to the SB because every other team has [massive] flaws (MIN: QB, NO: D, GB: QB/young/inconsistent, TB: QB/O) and because the NFC West SUCKS ASS!
As for the AFC, most teams are injured (SD, PIT, JAX, NE, IND) or have bad/young coaches (SD, BAL, CLE). Throw in the fact tough scheduling and Bad D's/young players and it's a recipe for disaster.
IMO, the only 'Legit' AFC team is Tennessee unless PIT gets healthy and/or SD pulls their head from their @$$.
All AFC teams have [massive] flaws to overcome, IMO, (including TEN, PIT and SD) and I think it will be tough to overcome them all season and the playoffs to take the trophy home.
I really think that an NFC East team wins it all this year, plain and simple. (Injuries and choke jobs not factored in, of course)