My system has polysulphone QDs and I've built one with camlocks and the other kind you are looking at. The camlocks are cheaper but you'll need 2 hands to connect them up while the other ones can be done one handed. BUT, when compared to the polysulphone ones, they get hot.
If I were to build my system again I'd probably go with the non camlocks if price wasn't an issue but then again, if I had to use the camlocks, I'd be fine with them too.
Another thing I'd read is that all of the QDs out there may not work together if you get them from different vendors. Just something to think about.