Just had to make this decision when purchasing my S-Works. I went with caliper brakes. Lighter weight, more wheel choices, I don't ride it in the rain (well... not by choice) but mostly, where I live it's pretty flat. If I were riding in mountain areas, I would have chosen disk. My gravel bike is disk and I've had other disk bikes. I have nothing against disks, but I also have nothing against calipers.