WhatsApp recently added a feature for transferring chats from Android to iOS. It’s a button under the chat settings on iOS, not sure if it’s in the same spot on Android. There also the Move to iOS app that will transfer your chats for you. Either option should transfer your chats seamlessly.

Your warranty will be the same wherever you go, but I do recommend getting AppleCare+ for damage protection ($9/month).

And yes, I’d recommend both the AirPods Pro 2 and Apple Watch. The new AirPods Pro’s sound so good and the volume adjustment feature works incredibly well. Highly recommend.