I'm a fairly big fan of Mario...
Super Mario Bros. 2, the USA version, is by far the best Super Mario game ever made. I've never played it in it's "original" Doki Doki Panic form, but
clearly the creators meant for it to be a Mario game from day 1.
The only time I've played the Japanese SMB2 was indeed on the All-Stars. It intruiged me enough that I wanted to get the Famicom version, until I found out it was FDS only.
Actually, there really is something about the way that one and the original SMB play on the All-Stars cart that bothers me. For SMB1, I'll take the original NES version any day.