For me it has always been the 8 iron, at least with the R11's, and both the top sets of Nikes.
I've had it go 150+ with full bs into headwind with uphill elevation more times than I care to think about. BUT, when I'm playing for the 8i to go long it always comes up short lol.
As far as the PW, all 3 have been pretty awesome for me. Can't remember any clubs before the R11's lol, and it was only 11 levels ago, but seems like FOREVER. :)