Present Toys has the better sculpt paint app. Overall, I'd say the Mars Toys is the better of the two if you plan on keeping it stock. The paint app is pretty good and the jacket is more accurate. One disappointing thing is that the shoes are entirely black and not two-toned like in the proto.
Personally, I'll be keeping the Mars Toys outfit, swap out the body and hands to worldbox and use the Present Toys sculpt. I might use the Present Toys pants since my Walt has brown pants.. don't want them looking like twins