I'm AA EXP and UA PE
I much prefer the AA experience (even as a Plat) but many times it comes down to schedules and price. AA has limited Asian routes. Yes you can use 1W but upgrading is almost non existant. AA has weak routes to Europe compared with UA (from SFO) and almost every trip, UA comes in significantly cheaper across the water.
Hopefully I'll be able to retain both status levels this year.