I think Kreider will get more PP time and be used when the Rangers are looking for a goal more often.
Difficult to directly compare them given they will likely be used somewhat differently and may have different line-mates.
I voted Miller not because I expect him to outproduce Kreider, more so because I think he has more ability to make his line better, vision, instincts. I guess I am biased towards who I perceive to have more of those abilities. So biased to the point I think Zucc is more important than Nash, yet never expect him to out score Nash if they played in similar amount of games.