Simply losing weight will take a load off and maybe you can avoid both for a while... I'd ride the knees until it's not bearable any longer before the TKR. I did my left tkr Nov 22and the right tkr in Mar23. Both feel a lot better. I do get sore BUT, I'm pretty active. The arthritis was
the driving force for me and the inability to run and gun the last 10 days of the '22 deer season.