I like VIII as well. VII comes in close second. VI is not bad, but MILES behind either of them. IV and V are yet more miles behind VI (but finished them, so they must've been doing SOMETHING right) X is somewhere between VII and VI (still have to finish it, so who knows what'll happen) IX.... I'm still undecided about IX.
And while the backstory of all the characters in VII was good, and I must admit better than VIII's 'we're all from the same orphanage' thingy, the characters of VII seemed a bit too..;. 'larger than life' to really 'live' to me. Vincent is a prime example. It's a REALLY nice story, but somehow, my heart bled more for Zell when Squall 'dissed' him than it ever bled for Vinnie....
I guess it's a personal thing. Different things work for different people, and you can't really say any FF is 'best' You can only say they are 'better for ME' or 'better for YOU'
It is not just 'new school VS old school' though. Point in case, I have yet to find the Final Fantasy that can make me forget Chrono Trigger. Same tech level about as FFVI, but between FFVI and CT, TO ME AND MY TASTES, there is simply no contest.