This is amazing, thanks so much for the write up Linea! My top 3 tanks currently are an SD/Elec, Invuln/EM and Dark/Staff. I was thinking of making a "Superman" type hero to give some of these tests a run, and was stuck between Invuln and Rad. It seems like Invuln is the, as you put it, the "more comfy" way to go. Not to say Rad CAN'T do it as well, it would just be an easier time for the Invuln.
+1 to EA on Tankers though! Love it on my Stalker. I wonder how they'd adjust it for Tankers.