I love both Brawl and All-Stars. My friends and I were just playing Brawl last night.
Most times, we like to mess with the rules and make it a 3:00min timed match, but have it sudden death. Other times we do stock matches.
The thing I love about Brawl is the large variety of characters and levels, but it is their 3rd game after all. I can't wait for more DLC to come for All-Stars!
(Brawl I main Pikachu. - All-Stars I main Kat.)
Both games have their ups and downs, but if I had to choose one, I would definitely pick All-Stars!
Playing PSASBR definitely helped me put Smash in perspective & see some of its hidden flaws. But it still gets a ton of things right, and PSAS still has a long way to go before topping it.
I feel like Smash Bros. is much more fluid than All stars. All Stars seems to be much more choppier and calculated due to pauses after certain attacks. Also what I don't understand about All Stars is that for example, if I'm playing as Emmet and I do my air down square and someone is below me in the air, I just go right past them.