I find that its good to use both Roy and Marth for a few reasons
-If you're new to the game you will get used to two different timings for your l cancels. (Marth is one of the floatiest while Roy is a fast faller.)
-You learn to space yourself from your opponent using Marth while with Roy, you need to get in close.
-With Marth you're more aggressive as an edge guarder as compared to Roy, who is more patient due to the fact that he cant exactly jump off the edge and fair, dair, etc.
-They both teach you how to tech chase well
Oh yeah-When you go from Roy to Marth...it feels too good!
Roy wont get you the W, but hes a good character to learn with.
Okay, I have two anyway, so it's no problem.
Whew! That was close.....
Edit-I love being in school now. I go on the computer between my classes, during my classes, and im still doing excellent in school. In the morning I get breakfast with this chick from my ENG class last semester...its in the process. YUM
I think i made like 13 posts today haha and counting!