Rim brakes / alloy rims / dry weather vs. disc brakes - it's a toss up (long descents tip to disc)
Rim brakes / alloy rims / wet weather vs. disc brakes - slight advantage disc
Rim brakes / CF rims / dry weather vs. disc brakes - slight advantage disc
Rim brakes / CF rims / wet weather vs. disc brakes - not even a contest, disc wins.

Yes, I speak from experience.
My full CF bike with Di2 and rim brakes is now relegated to my indoor Zwift training, replaced by a full CF frame / CF wheels, SRAM wireless with disc.