That's tough for me because I'm usually all about offense. I use upper tier pitchers to trade for upper tier hitters so in this case I'd probably lean toward Miggy. I tend to stream pitchers a good bit so I'm not big on owning a lot of top pitchers. It's a strategy a lot of people aren't comfortable with but I think I'd take Miggy. Especially with third base eligible.
Who do you have at second (if you're giving up Pedroia)