Honestly, i love the simplicity of Quick Cache versus W3 Total Cache. Quick cache is Multi-sites, easy to setup and user friendly. The multi-sites is very an advantage for Quick Cache.
But Quick Cache have nothing to integrate CDN. I have an account with MaxCDN and cannot use it with Quick Cache instead W3 Total cache who's facilitate the integration with CDN.
Too bad because i think if Quick Cache can integrate or facilitate the integration of different CDN commercial and none commercial it will be an excellent alternative for W3 Total Cache or WP Super Cache who's are very paint full to integrate with WP 3.1 Multi=Sites.
So with regret i will have to go with W3 Total Cache because of is CDN integration but it is not very well done for Multi-Sites.
Regards