As a person who owns a bike with good disc brakes as well as a bike with good rim brakes, I can say with authority... they will both stop a bicycle. Discs modulate better, and absolutely do not care about the weather. I can brake every bit as well in pouring rain as I can on a sunny afternoon. Rim brakes are simpler, lighter, and less fussy.
I've said this in other threads, and I think it bears repeating: We can actually exist in a world where we all like different things. Personal preferences exist. Rim brakes are not intrinsically inferior to disc brakes, and vice versa. They both work. They can stop a bicycle.
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