Misa vs Smith is an fun one.
Obviously all of our young guys are far from finished products, which imo applies doubly for Smith. His vision and IQ are elite. It's his skating, strength and conditioning that need work. GMMG has mentioned many times that he loves Smith's compete. This is a player that will work on his deficiencies—some of which will naturally improve with age, like strength.
From the few games I've watched of him, Misa's IQ was impressive, as well. He knew when to make a pass, when to take a hit to make a play, and had limited boneheaded mistakes. Also love his skating. While his vision isn't as impressive as Smith's, his physical tools are more attractive. For that reason, I'd also give him a slight edge on floor. That said, Smith's floor is higher than many give him credit for.
Both players have 1st line potential but I'm a Smith homer so I'll give the edge to him. Also because I like his vision a touch more. But mostly because I'm a homer. I mean, comon' did you just see him run that PP against the Habs?