Sapphire Reserve includes travel delay protection Amex Plat doesn't.

If you've got a Schwab Plat, you can transfer points out at 1.25 cents each, and I haven't seen any reports about those getting turned into 1099s (I wasn't expecting to, but there were some concerns since it's bank-associated). Being in this boat and not worrying about travel delays so much, I'm generally putting my airline spend on the Plat.