For depth and breadth, I don't think Håkan Kjellerstrand can be beat. (hakank.org) The downside is, you have to do a lot of reading to figure out what's going on. The upshot is, it's all in one place. I don't know that there's any great introductory material that will give you a brief comparison between systems -- it may be that solving constraint satisfaction problems is just really hard, and there's no summary that can do it justice.