None of those appears to be Android, which IMO makes them have less utility value. There's definitely pros and cons though, and one should research which is right for them.
Sure, the hardware is great. Depending on what you do, it's the software that is miles behind. The Android app situation is worse to begin with and Android developers pay almost no attention to big screen tablets because so few people have them. The app situation on the iPad isn't amazing, but it is better. I think Procreate alone is responsible for a lot of iPad sales.
Plus Android tablets are deceptively expensive. They aren't going to receive updates for as long as the iPad and when you sell it, the resale value is as good.
I know the Remarkable has some third party software for it because it's running a version of Linux. The others probably do as well.