The Miis I'm going to be making are the original models for the characters and then for the ones for the Character Mii costumes.
That aside, out of the 3 of them:
-I do enjoy using the Mii Brawler, although they definitely had the weakest DLC/Character costumes in Smash 4. Their regular outfits were better, especially the Vampire Garb. That said, the new costumes are looking good. Skull Kid and the Labo are decent, but the Ribbon Girl and Nia outfits are great. Here's hoping for some more good ones.
-The Gunner I enjoy the least, which is sad cause they have some awesome costumes and we are getting a RayMKIII and Saki outfit for them.
-The Swordfighter....they have the best costumes and the Yiga outfit is awesome too, but I would like them alot more if they had a different Forward/Up/Down Aerial. I love their Neutral and Back Aerials, but I really dislike their other Aerials. And there are times when I wish they had a few more unique Specials.