would you choose a flight that's $200 more expensive because it has starlink?
No but the airline might choose starlink. I think a gogo business install is on the hundreds of thousands and annual costs in the tens of thousand for their Eutelesat based system.
Maybe not $200, but $20-$50 for a cross country flight for sure.
If I’m flying for work and Starlink is that much better, quite possibly. My wife’s experience with other in-flight WiFi providers has been quite poor, often to the point that it barely works. Having said that, neither of us has been on a flight with Starlink yet.