What ever you do dont start with brown switches, they are crap. Go for blue or red switches in Filco.
I thought brown switch is the most popular starting switch, like precarious said it's the most balanced of all switches.
Good for typing, gaming, and doesn't make loud noises. In fact my first keyboard had brown switch.
Do we all love our first modern mechanical keyboard?
Yupe even though I know in general geekhack isn't too fond of Das Keyboard. But personally I still love it and now it will be cooler because you can't get Costar made Das Keyboard anymore
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To answer OP, I haven't heard any complaint on either keyboards actually. So you can't go wrong.
Though due to availability and popularity, Filco brown might have an edge over Quiet Pro since it's been out longer that and Filco is worshipped as the best brand. However I'm very interested in buying a Quiet Pro recently so if I do end up getting one I'll let you know.