His original, yellow and black, fingerless gloves and kneepad look, or the blue and black, no kneepad, full gloves costume?
 
Personally, I think I preferred the original costume more, although it doesn't make too much of a difference to me and I think they both look good.
 
EDIT: Also, what did you think of the costumes for the alternate dimension Invincibles? Any of them look better than his actual costume to you?

His original costume looked like a Swedish flag with goggles, so obviously I like his blue-and-black one somewhat better.

I like the newer one.

like the blue and black 
from the alternate invincibles i like the yellow and black with the cape

I love the original..

blue and black looks the best

I love the original!

To me, I like the original, maybe its just because thats when we really get to know the character, and get use to him 
 
that and he looks wayy more bad-ass

i like the old one but i can see how some people wouldnt

the original is better

black and blue imo

I like his old costume

I prefer blue and black suit for Invincible.

I prefer the original colour scheme, I think it makes him a little more unique (there aren't many superheroes who wear yellow) and I like the fingerless gloves more. But the kneepads were always a little redundant, as Art eventually pointed out. They were just there to get broken. So the current costume is my favourite.

Check the new outfit from Invincible #79:

the blue one rocks