So its between yoshis island or meroid fusion. I love metroid prime and I liked the original metroid game but thats the only 2d metroid game I've played. I haven't played yoshis island before. Which one do you think I should get?

Metroid imo

If it were the original SNES Yoshi's Island I would say get that, but since it's the GBA Yoshi's Island I'll say go with Metroid Fusion.

I'd say Metroid Fusion, as its probably the better platformer, not that Yoshi's Island isn't fun to play as well.

I'd say Metroid.

Reason being is that it's the GBA port of Yoshi's Island, as opposed to the SNES original.

Haven't played either, myself, but I'd go with Metroid

Metroid Fusion

I'd go with Metroid Fusion. I've never cared much for the Prime trilogy, but the 2D entries are great. Yoshi's Island still holds up pretty well too, but you'd be better of with the SNES version if you wanted to play that.

Fusion.

Metroid all the way.