NAK was more impressive, he's NHL ready and playing above expectations (though one reason is he lowered those expectations from two years ago). He looks like he's improved his puck skills and played with high energy on a consistent basis. Fast, physical (listed at 5'11 211 lbs in TC and plays like it).
Farabee is far more talented than NAK, but it was clear that he physically isn't ready for the NHL in the sense of playing up to his potential. He's talented enough for a 3rd line role right now, but in 3 years when he fills out I think he'll be an elite first line forward - right now the lack of strength means he struggles to play "his" game which is more like Lindblom than Giroux, that is, he likes to go to the dirty areas, fight for pucks along the boards and hang out near the blue paint. Tough to do when you're 6'0 and south of 180 lbs (listed at 6'0 171 on the TC roster), even when you're strong for your size. When he fills out to 6'1 190 lbs in a few years (see his brothers, Jacob 6'4 201, Jesse 6'3 185) he'll be tough to handle.