Groupset upgrade
 

I'm riding my bike for over a year now. My first bike was Fuji Transonic 2.9 with 105 5800 groupset with FSA Gossamer 50/34T crankset. I recently bought a used aluminum Cannondale with a 9 speed Dura Ace 7700 groupset (Ultegra crankset) with a broken right shifter. I was planning to buy a mini Ultegra R8000 groupset (shifters, front and rear derailleur, cassette, chain) to upgrade my Fuji and transfer its groupset to my Cannondale. There's a 105 R7000 with the same mini groupset components that is $150 cheaper, is it worth it to go with the Ultegra? or just buy a pair of Sora R3000 for my Cannondale? Any option suggestions will be highly appreciated.

Thanks

I'd make sure the cannondale has a 9/10 speed wheel (instead of 7/8/9) so the road-11 speed cassette from the R8000 will fit. Yeah, that sounds confusing.