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it really depends on the frame, nothing to do with braking power as @Howard pointed out. If you want equal joy and experience of your R9100 brakes stay true to the medium. With discs although, heavy ugly and expensive its sadly hydro. Or just dont get a disc brake bike. There are plenty more braking options that I am willing to discuss at an hourly rate plus VAT.
Trek has done a great job on the new Crockett btw. I have spyres on that and they are at par with hydros but again massively frame dependant.
I still read regular stories of "the best" hydro brakes leaking/breaking/blowing/generally fucking up.
A cable is a cable. You know it's either gonna pull or it's not.
Plus why are road Hydro groups so fucking expensive and so fucking ugly?
I'm in the throes of planning a new build and quite similarly considering going for cable pull discs again....
Remember reading something about the national American gravel race champion still using Spyre's with SRAM eTap....