I honestly think no other codex is going to be as good as the nids one, the tyranids codex might not be top dog, but it for sure has the most viable options and playstyles, its teh best codex (other than 7th corsairs) ive seen in 5yrs+
With that said, better WWP system, vehicles upgrades back, and better HQ's. The rest are just point changes other than Reavers. Reavers needs an overhaul and i would imagine like a nids one they would get that.
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AoS: BoC 8k, CoS 3k