I commute on rb and cx. MY strong preference is to use rb as much as possible, even in rain (rb has no fenders, cx has full size fenders and rack/panniers). The cx is not as fast as rb, nor as maneuverable in tight traffic, and the brakes aren't as good either. But what the cx lacks in those areas, it makes up with the following:

1. very comfortable
2. not as fast as rb but realistically not much slower when consider stop/go traffic + light signals and cautious speeds in traffic.
3. no sweaty back with rucksack thanks to rack/panniers

I have no experience with the tires though, I only use 32mm Burroughs and have not yet ridden it in snow0like conditions.