honestly, i would have to go with Gomi here.
Kid is one of my favorites, but it comes to size here. both have outstanding wrestling, though i believe Kid has the edge. I believe Gomi has the better striking, it's more fast paced with more power, even though Kid has KO power and hand speed as well
but Kid normally weighs in at 145, and is 5'4". He has the ability to dominate a lot of opponents due to sheer talent, but Gomi could physically bully him, and can match him on all the dominant aspects of Kid's game