For domestic US there has been a pretty dramatic shift. For this SFO-based flyer I am transferring from Chase to UA for most domestic award tickets because it's a better value. Especially to DC. I have UA Silver which opens up more seats. UA is switching to dynamic pricing so this may level out with AS, so both will be bad value.

For international this year I used AS miles for 2x biz AY TXL-HEL-BKK and 2x biz EK SFO-DXB-SEZ/MRU-DXB-SFO. Couldn't get decent BA availability so booked 2x biz VS SFO-LHR with DL miles. But I have now blown a bunch of AS miles and am not earning that many more.