All depends on what you like, man. I think both of the Spider-Man 3 Spideys look a little fat; they've got this round, chubby gut thing going on. I also despise Raimi's Spider-Man films, and would never buy one of those Hot Toys. What's more, I've heard from many a reviewer that the Spider-Man 3 costumes are painfully delicate and do not hold up well.
As far as costume materials are concerned, of course, we don't know what this one will be like. But Andrew Garfield IS Peter Parker to me. I love this movie and this costume. But I think that with figures, beauty is in the eye of the beholder. If you like Spider-Man 3/Tobey Maguire, then go for it. Either way, Hot Toys are expensive, so you gotta make sure that you spend some time thinking about which ones you want to spend money on.
If you're a comics fan, then maybe you aren't totally satisfied with the symbiote suit in Spider-Man 3. Marc Webb, director of the current series, apparently said once that he'd like to do Venom justice. So, I suppose there's a shred of hope that we'll see another take on the symbiote storyline, which means possibilities for another symbiote suit Spider-Man figure from Hot Toys. I wouldn't hold my breath, though. If you like the look of the Spider-Man 3 one, go with that. But I don't think either figure will give you more bang for your buck, it's just depending on what you like.
And this is my first Hot Toy, too.