I don't have any blues, but I can explain that browns are lightly tactile. If I'm typing quick, I almost don't notice, but If I'm slowly scrolling through an ebook, or forum, it's pretty easy to feel.
I'd say get blues if you're lightly gaming, as blues are supposed to be pretty good for that. I used to game on my unicomp, and it worked out pretty well (although the 2KRO hurt a bit)
From what I have seen, there's not too big a difference between them quality wise, but the Leopold has a less "standard" spacebar. semi-universal ones are being made, but compatibility can be an issue. Also, I think I read that leopold uses cherry stabilizers, whereas filco is costar ofcourse.
I've only used cherry style once (on a 10-unit spacebar on my WYSE) but I think I'd prefer costar stabilizers, it's not a huge difference though.
If you like tenkeyless, you should consider the CMstorm, which has at least as good build quality as filco, and has removable cable, etc. Fol fullsize, I've read that the rosewill (despite having an ugly logo) is also about the same.
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Point is: you should be happy with either of those.
Also, have you considered a Model M? I much prefer it for typing and daily use than my other mechanicals (for the moment).