Can’t put pics up (although others have) but the Gringo figures are roughly 4-5 mm taller and chunkier. It comes down to what style floats your boat (aren’t we lucky to be getting two such ranges to choose from!) but, personally, I am very much going down the Empress route. Their current range is also more extensive plus they clearly have a lot of aspiration re how far they propose to take the range.
I should point out I am a little biased as I have worked with Empress extensively on their ECW range so appreciate just how much work they put into a range and getting it right (and how, when they say they are going to do something, they will deliver). The vehicles Rich C has been working on also look excellent- can’t wait to see them in the flesh (or, should that be “in the resin”?).