In reply to higgywins:
I use one of those Beal Dyna clip things as I was bought it as a gift, but no problem to use slings or QDs it's all about personal preference.
Personally I like to use screwgates when I'm anchoring, just feels like I'm less likely to accidentally remove it if it's got a screwgate on it.
What's probably more important than the gear you use to attach yourself is the what you do once you get there. You get all sorts of different configurations of chains/rings/staples/mallions/biners at the top of a sport route, so there's no one easy answer for what to do when you get there. The key is to make sure that at all times, even when lowering, you are on two points of protection.
Ask yourself what happens if one of the bolts pops, if at any point the answer is you'd fall to the ground then you modify your method.
For example imagine you've seconded a route, unclipped but not removed the QD's and you're now at the top with your Petzl anchor and find that the belay is made of 2 x glued in staples, each with a QD in it with the rope going through, but no chains or rings or anything like that to connect them. You need to clean the route and lower off. Would you know what to do in that situation?