I'd have to say that Ultimate is better.
I mean, it seems that it does stay truer to the spirit of who Peter Parker is, and what the character of Spider-Man is all about...
RESPONSIBILITY.
I haven't seen any sense of responsibility from Peter in ASM in ages.
Some say that Ultimate is just a cheap photocopy of the original ASM, which in a way, it is. But I think the whole reason the Ultimate line was created was to give new readers a jumping on point in the Marvel Universe without having to know the 40+ history of the 616 universe. It served its purpose for that and I enjoy it very much when I look at it that way. Plus, i just love Bagely's art, which got me hooked to begin with. He's gone now, but in almost 10 years of Ultimate Spider-Man there has been consistency. Growth and development in the characters, plot twists, excitement, & fun... continuity has been the norm in USM,
not the exception.
Which is much more than you can ever say about Amazing Spider-Man.
And with BND, it feels like Marvel hit the reset button on Peter for no reason. That's what Ultimate was supposed to be for, right? It feels retro, which some readers may like, but I absolutely hate with a passion. The only readers that like the retro Peter are the "old-timers" who remember picking up a first edition 70's ASM book. I started in the 80's, but I have no desire to read a regressed Peter Parker. It's just so...
forced.
So yeah, in terms of enjoyable story, continuity, natural storytelling, character growth, responsibility, the true
essence of what a Spider-Man book should be, the true nature of who Peter Parker is and
why he is Spider-Man when he doesn't have to be... that's Ultimate all the way.