I would say generally the Kraton is the better option. The Slash 4x4 has a ton of parts support, both stock and upgrade-wise. The Kraton has less support but that's getting better over time. The main thing is that the Arrma 6s lineup is just beastly in terms of durability; I have a Typhon and even after hard bashing and several nasty crashes, nothing broke. I would go with the Kraton hands-down because, out of the box, it's set up to handle twice the power of the Slash 4x4. Good luck and welcome to the hobby!