Miller is 3 years young, has more upside, is significantly more healthy and has better results. (Trot out FIP all you want, but when you have a 644 IP sample size your ERA tells a good chunk of the story IMO. Nunez has turned back into a pumpkin anyways, he is a decent hitting but poor fielding Util guy (and it opens up a spot for Polanco) Basically you flip a 28 year old #4 (with injury history) and Nunez for Miller, a guy who at worst will be a 4 for you, is only 25, has more upside and could potentially be a #2 type.