So I'm building my first rack of quickdraws and I'm deciding between the quickwire, quicksilver and freewire. At my local shop they're about the same price. Are they all sufficient? Should I get a variety? I've heard of gate flutter and all that, but I'm not sure how rare it occurs.

On a related note, what about sling/dogbone length, would it be good to have a few longer ones? Thanks for the help.

Gate flutter is when a solid gate carabiner hits against the rock face and the gate pops open potentially allowing the rope to slip out. You can show this by taking a solid gate biner and hitting it against the palm of your hand. You should be able to get it to pop open doing that. Wiregate biners don't do this because the lower weight/mass of the gate makes it so you can't really pop it open. It isn't common but it is something I'd recommend using wire gates for to prevent. Wiregates are also lighter so it won't hurt to go wiregate. Slings are usually 12cm long and that is usually just fine. It's a good idea to have some longer draws for those uncommon situations where you need them. You don't necessarily need to have a variety of draws unless you want to. I personally have 10 of the Firewires and 2 longer draws and that works out fine for me So if I were you I'd go with the Quickwire or the Freewire. Both have wiregates on the rope end of the draw. The Freewire is a little lighter since both biners are wiregates if weight is something you pay attention to though their weight difference isn't huge.