That one with no platforms.

I'm not a big fan of Final Destination. Fighting Link on that stage can be a real pain with all those projectiles he keeps swinging your way!

From what I played it would have to be Delfino Plaza.

Eldin Bridge, followed by Corneria. I like my levels flat and barren. I like fighting, not worrying about what the hell the level is going to do to me next.

Easily Spear Pillar.

Least favorite is probably Rumble Falls, but even that's not bad.

I don't know why people don't like the classic Mario Bros. You know there is a trick to fighting on the level right? Use the animals. It plays a lot like the actual Mario Bros.

^^^^ Yea I know the trick very well ...my lil bro pwned my ass with the crabs and turtle 1 hit ko every hit with them almost .......I like every level cept the really flashy and moving ones ....Thx god I unlocked the additional rules thing . Now i can take all the level i want off and can hit random button safely without getting a crappy stage :)

From observing matches all the way from England I'd have to say Toon Link's stage Pirate ship is my favourite to look at.

My favorite is probably The Wind Waker stage with about 5 tied for second place in my book.

I hate both Delfino Plaza and Classic Mario stages cause the turtles and crab things seem to kill the crap out of you, I love the look but it fits the stage too well at times where I just don't seem to pay attention and get hit by a renegade purple crab. Also I've had problems on the Helbred and the Fire Emblem stage as the backgrounds are pretty/distracting to me and I lose haha.

my favorite are final destination, and the bridge of eldin. i mostly like the flat and simple ones. new pork city is my least favorite, its too big and its too much going on

If you were really good then it wouldn't matter would it?  You would get the animals faster than your brother and be better at dodging and catching items.