Comparison:
WoL and WCL have a lot of the same features (extensive querying) and very similar layouts/navigation, but WCL has a replay thing that's pretty cool. So that makes it an attractive options.
AMR: We have extensive data as well (but not query-tools). Our infographics are not just a cool layout, but provide unique data to help teams figure out how well they are doing. We also can tell you how well you play for your specific itemlevel and gather
gear/talents/glyphs at the start of every pull.
We actually keep in touch with the person behind WCL quite a bit since we are focusing in different directions. And that allows both sites to make cool features (both sites only have 1 developer), since there isn't enough time for either site to build EVERYTHING. That's awesome for the end users, so uploading to multiple sites to get access to all sorts of cool stuff, is what I'd recommend.