I have and use both an ATC and a GriGri2, also still have a GriGri... Depending on the application both device types are great to have. My wife uses a Cinch but I always found that a bit too small and cramped in my hands.
I agree that the GriGri2 is initially a bit harder to use than the GriGri... It locks up more aggressively than the GriGri, which safety-wise I suppose is a good thing, but it makes it harder to maintain a smooth lower. The ATC feels more intuitive for lead belays but I've figured out how to make the GriGri work effectively. The GriGri is great for me a I do a lot of solo TR at Pinnacles and is great for setting up draws on routes with directional issues.