Security wise Apple is the best.

If you are heavily involved in crypto I think it is always good to have Apple products. I remember reading a few months ago in reddit how an user was hacked for having a rooted android and using a public wifi losing a lot of crypto money because of it... of course there must be several security flaws in order for a hacking to succeed (like a flawed virtual wallet), but starting with a safe OS is probably the best option. Besides, the Apple App Store is probably the best app store there is with tons of exclusive content.

Just for the security, I would recommend iOS.

Cheers!