The other thing to mention is that Cannondale and Specialized (there are probably others?) have in-house cranks that are designed to work with their frames, Cannondale with their SiSl2 crank and Specialized with their Lightning variant.
The new (6800 and 9000) Shimano groups have managed to eliminate the compact/standard issue by producing a crank with a whole new bolt pattern that can have 50/34, 52/36 and 53/39 on it, but the only powermeter option is Stages as the spider is not removable.
The other thing to mention is that Cannondale and Specialized (there are probably others?) have in-house cranks that are designed to work with their frames, Cannondale with their SiSl2 crank and Specialized with their Lightning variant.
The new (6800 and 9000) Shimano groups have managed to eliminate the compact/standard issue by producing a crank with a whole new bolt pattern that can have 50/34, 52/36 and 53/39 on it, but the only powermeter option is Stages as the spider is not removable.
For this reason I have a Stages on order.