what are the bikes, do they have the same BB/cranks, what pedals do you use - are you willing to change, etc.
Two Canyons & a Giant. Canyons both have Shimano Ultegra and Giant is Sram. Use SPD-SL and would really prefer not to change those...
All the same braking systems? If so, powertap hub might be easiest.
How hard to get Ultegra/105 on the Giant? If they are then all the same chainset/crank length you could get a 4iiii, the 105 version was on sale for £260 at Sigma this week.
@jakemcree started
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what are the bikes, do they have the same BB/cranks, what pedals do you use - are you willing to change, etc.