They just feel more solid. I like s good solid feel to my keyswitches. I found that while I did like blues, the tactile point and click were almost too sharp. It felt "thin". That's the best way I can describe it. Browns had a bit more of a solid feel to them (probably because I bottom them out a bit more). I like the deeper sound they make rather than the high pitched "click" of the blues. It's more of a "clack". Also, the slight tactile point gives me feedback that the switch is actually doing something.
However, I've found that as far as Cherry switches go, it depends on what I'm doing. For gaming, I definitely prefer the reds. But for working/writing, browns followed by blues.
Although I'm really, really starting to think that I might end up preferring Topre to all of 'em.