In reply to leewil86:
Most UK climbers can use trad and sport quickdraws interchangeably, and in reality the differences are pretty marginal and mainly concerned with usability rather than safety. For example, thick sport draws are easier to pull up on while dogging, but thin trad draws are more flexible so less likely to lift gear out.
The metal burring issue already mentioned is very real but needs to be taken in context. Krabs won't develop nicks from bolt hangers unless they are fallen on, and most trad climbers rarely if ever take many falls even when sport climbing. Then even if falls are taken and krabs develop small nicks, as long as they're still used as the top krab in a quickdraw to clip pegs and wires there doesn't seem to be a problem. Indeed the only known problem is using such damaged krabs for directly clipping the moving rope.
As far as I'm aware any opinion on risks of using such krabs to clip cam slings is just that - opinion. The demonstrated mechanism by which a sharp edge can damage a fast-moving weighted rope will be very different to that applying to the static loading of a sling. It's very hard to cut nylon with a serrated knife if you only push down on the knife and don't slide it. That's not to say it couldn't be possible, but it must surely be a great deal less likely.
My opinion is that most trad climbers should only need one set of quickdraws for both trad and sport. If anyone finds themselves doing a lot of sport, and particularly if they're taking lots of falls in the process, they might benefit from a dedicated set of sport draws too. But regardless of what climbing you do, everyone should really be inspecting their quickdraw krabs from time to time to make sure they aren't developing any sharp edges inside.
