Gaaah.. this is a really hard one since I pretty much like all of their songs O__o
But just because I don't feel like picking everyone else's favorite song, and since I'm such a badass my favorite SUJU song is...

Rukkoko

Hahahha I have no idea if the song's name is Rukoko or not, but because they keep yelling "Rukkoko" I'm saying that that IS the name of the song ^^

Hahaha Leeteuk looks so badass in this MV xD Look at 0:40. Hahaha he's like "DAAAAYYYUUM~" AND WHEN HE EATS THAT BALONEY!! Now that's fan-serive. I don't think they went "ahh~ lets make him eat a bloney just because". Naaah, they probably knew what it looked like.

I was thinking about something.. when Idols eat pen*s-shaped stuff.. they do realize what it looks like, right? They can't be that stupid, right? It's all fan-service.. right? xD

And from 1:11 the MV just goes epic!! ^3^ Like the fighting scene between Eunhyuk and Shindong at 1:33, and hen Eunhyuk winns at 1:53. HAHAHAHAHA EUNHYUK!! Y U SO CUTE!

So yeah, this is one of my favorite songs out there from SUJU. I also like "No Other" "Mr. Simple" "Sorry Sorry" "Superman" "It's You" and all the other 34230 songs theu have ^^