I have been typing on Kailh BOX silent brown switches for the past few months and I think they are quite good. They have a very sharp tactility, which some people seem to mistake for "clicky", but these are not clicky. The click leaf inside does not make any noticeable sound, and the dampeners on the stems do a good job of reducing the bottom-out and upstroke noise (which I hate with a passion). Moreover, they are 3-pin switches which fit into Kailh hotswap boards, and that's a big plus for me.
I have not tried Gateron silent brown switches so I can't compare, but they are 5-pin switches which means they don't fit into Kailh-style hotswap boards.