well let th discussion begin
Varia, Gravity, Phazon and Light Suits.
All of the above are awesome. Plus they all have good uses.
i think gravity was useful but not very good looking
Coolest looking was the Light Suit in my opinion.
Purple is one of my top colours, hence me loving the Gravity Suit. Blue is also, so another reason. And I loved its use... better than the crappy Gravity Boost in MP2.
i think hazard was the coolest looking
Hazard suit didnt really add anything appearance wise though besides the shoulders.
No suit?
i only liked the hazard suit when the acid rain rained on it
PED suit and Phazon suit
awesome.
and the Light/Dark suit.
P.E.D. suit prior to when samus started getting corrupted.
The Varia Suit was sweet. It's capabilities tied in perfectly for the story mode in Fusion
wait, no! i voted for phazon suit, not all of the above! grrrr...
Varia and power suits. Nothing better than the originals.
No suit?
My all of them vote counts for this one, doesn't it? 
I'm assuming that's that the "0 suit 
all" is?
I assume so.
Zero Suit. Its smexy... but in terms of use... it blows. Stupid Metroid Zero Mission *shakes fist at Zamus*
Lazer whip FTW. And smexyness FTW. And... you get the point. I didn't think it was bad.