That's fair enough, as with any comparison there are people who would fall on both sides of the fence. I feel the best balanced progression comp is 1 Assassin and 1 Juggernaut, however there are fights where 2 juggs would be better or a different comp.
I think this *will* be the best comp once the spikiness issues are reduced from RNG death to just challenging to heal. It was my favorite comp pre-2.0 (even with the very real Juggernaut threat and DPS issues), and it has only gotten stronger as a pairing in 2.0, save for the assassin spike death problems. My group currently runs double shadows just as a function of what classes our best tanks play, but there are many times where I long for a guardian.
In any case, I'll stop derailing as well. :-)