Question: are kavats better than kubrows?
Answer: Kubrows will be a bit beefier/tankier, while Kavats will have a defensive ability. Kubrows do more raw damage, Kavats have better crit stats. The main thing you are looking at with Kubrows and Kavats is what utility they provide. For just pure general utility a Smeeta Kavat or Chesa Kubrow are probably your best bets.