Any reason for Revolut and not Cash App? (In US)

No, not that I am aware of. Just don't risk your main bank account if you are not ready to go bankless. That's not me saying that becoming actively bankless shouldn't be anybody's goal here. Personally I am working hard at it.

I have used Wise for p2p buys and have never had a problem. Useful because you can switch between currencies with little friction.