I have a Canyon Endurace with a 105 crank and left side 4iiii power meter, and a Cannondale Topstone with GRX crank and left side Stages power meter. My Topstone is my go to bike for the trainer because it feels stiffer. I’ve been thinking about getting 4iiii to install a drive side PM on the Endurace 105 crank and that would run about $300. On the one hand, I like the idea of having the L/R data and maybe the power numbers will be more accurate, but on the other hand the left side only PM seems pretty accurate compared to my Kickr (usually 1-3% higher than the Kickr but this is probably within the margin of error and doesn’t take into account drivetrain losses.)
Do you think it’s worth the upgrade to have L/R power on one bike? It would be my go to bike for fondos/centuries and maybe trying road races next year.