After buying more than 10 different saddles (and checking many more) found one that doesn't make my butt sore after long outings. Doesn't matter if is over the MTB or my Hybrid (my longest outing with the MTB: 5h, with the hybrid: 8h).

I'm referring to the Selle Italia Max flite gel. You can check it out here: Selle Italia :: MAX « Selle Italia

All should start measuring your butt bones. My measurements fell between the L2/L3 in Selle Italia. But your 'two amigos' have the last word. Get measured, check different brands and decide.