The XL1 is pretty much old news now... go for the XL2 as it at least has 4 channel sound built in compared to stereo on the XLS, the XL2 looks cooler too and well why not go for a Panasonic instead as they are better and more feature rich...
Only benefit of a Canon is if you already have a Canon DSLR which would allow you the option to use your DSLR lenses as far as I know...
But the Panasonics perform much better than the Canons and frankly most professionals I know use Panasoonics kits... and I always place it higher on my purchase list when looking at broadcast cameras or production cameras...