I wouldn't say that
SMW's Yoshi is always a good thing. I've heard some arguments that Yoshi was too much of a good thing that could drain some of the platforming challenge in the game. Which is also why I like the way Yoshi was implemented in
NSMBW.
By the way, I'm not sure I still agree with my first post. I said along the lines that
SMB3 is my favorite for artsy reasons and not for gameplay reasons, but after playing some more
SMB3 on its 20th birthday, I was pleasantly surprised by some level designs. Nintendo really deserves an award for World 6-5! And that fortress made of pure ice with sliding Thwomps? Genius! I still adore
SMW (especially for its map design) but there's something about
SMB3's level design.
I'm saddened by the lack of taste in the forums... how can the inferior SMW have more votes than the far superior Super Mario Bros. 3?
Nah, don't go there! I may agree with you, but that doesn't mean that others aren't entitled to their opinions.