AA has reduced availability from SFO-JFK - 3 flights offered per day and costs is 2x

more options are offered via CodeShare via JetBlue or Alaska

Im EXP and stand a decent shot of an upgrade on a domestic flight - have loved the lie flat options on the SFO JFK route on the AA Sharklets

since it doesn’t seem like I can fly AA due to 2x cost, does it make more sense to fly Alaska (where an UG is a possibility) or JetBlue ?