I had the same question last year when I was pondering the prospect of bringing my 1972 Motobecane Grand Record 'up to snuff' for a return to road-biking after a decade's hiatus. Wasn't sure I would be motivated to make the effort, not having done any biking since moving from flatland (NE Illinois) up into the Driftless Region in SW Wisconsin (NOT FLAT!!) so I bought a Kona Dew+ to commute with. Came with discs. The MotoGR has rim brakes.

Cut to the chase, I bought a Specialized Tarmac SL-7 early last September.

I put enough miles on the Kona to understand it's not really a road bike, then I started getting things to mount on the MotoGR to bring it up to snuff for the roads and terrain where I've been riding; built new tubeless wheels, mounted new tubeless tires, changed from x2 to x3 up front, swapped a 14/34 FW for the 14/28 it came with back in 1972, and a 'recycled' SunTour RDR w/ hanger to better take extra chain links. Oh, and a threadless quill adapter and more upright VO handlebar. Money (and time) well spent!

The MotoGR's my commuter now, the Kona's gonna get sold next spring.

I like the simplicity of discs myself now, having ridden with them for a couple of seasons. I seldom ride when it's wet so there's little change in my braking habits between rim vs. disc. I'll have to have more experience going forward but for now I like having discs myself. YMMV.