When it comes to Hardest to best utilize it is always a mix between Drg and Mnk for me. I'm currently more familiar with mnk rotations than I am with drg, but with the sheer amount of "bad drg" I've run into it makes it seem like it is somehow harder as a job to me. The amount of really good drg I've seen is few...and I do mean very few. One used to be in a coil group with me and was parsing near 370-380 while most the rest of us were in the low 300's in roughly same ilvl gear. I'd imagine, if he is at 105ilvl in gear now he is probably doing far better. Drg is more dependent on when to use buffs with what attacks, where mnk isn't so that puts it higher on difficulty in my book.