I spent so many more hours on SMW than any other game. Sure, I've played SMB1 and 3 a lot (and SMB2 eventually, heh)! But I loved the SNES so much, I used to play it over and over and over. It was my only SNES game for about a year, since games were so expensive to me back then. I rented a bit, and friends brought over other games, but it was pretty much just Mario for a year.
However, going back to SMB3 after SMW, I really liked it more. Maybe I was just sick of SMW, lol. It's silly, but don't really like the SMW graphics as much as those beatiful All Stars and GBA SMB3 ones. The main reason though is that there are more suits in SMB3 than SMW. Yeah, there are different Yoshis, meh. I think I just got really sick of SMW,heh.