Sumo
Sumo, palms in, no straps until I start dropping the weight which is pretty quickly. I suck at deads, my forearms are by far my weakest bodypart, even with straps, my forearms are holding me back on this exercise. To remedy this I am trying this: alternate each week-full deads, then partials. On partials I try to concentrate on my forearms for 3 sets, then do my three heavy sets for my back. On full deads it's all about the deadlift-for back.
Stiffs ARE definitely for hams if you're doing them right. You might be thinking of a "parillo" type stiff leg, where you intentionally arch your back and knees are at 5-10 degress. I have done stiff plenty and I feel them in my hams exclusively, that's how I like it too.
Rugger