I just came across this clip of Wawrinka and Murray hitting backhand to backhand (start the clip at around 5 min.) https://www.youtube.com/watch?v=m4Tq0hOR_7c What I'm noticing is, while Wawrinka has one of the best 1-hander in the world, he seems to have trouble keeping pace with Murray. Or, rather, Murray seems to produce the same pace and heaviness than Waw but with less effort. I'm not saying this short clip will end the debate once for all, but I just thought I would share. Wawrinka actually hit some nasty BH in it, but it just feels like Murray, with its 2-hands, can do the same with more ''ease''. And this (perceived) ease is what has always lured me into switching to a 2-hander.