I found myself getting quite a bit of accidental keypresses on my reds, in the beginning, however, it has goten quite a bit better. I use my browns mainly, but occationally switch to my reds (mostly due to TKL vs. Fullsize), but I don't notice too much of a difference on the switches themselves.
All in all, there's not much of a difference between them, but reds feel a little more "smooth" than browns.