Trade advice

Hey everyone, first time post, but I read a lot of the SBN blogs, so I figured I would stop by for some advice. I was offered a trade in my H2H league where I would send Neil Walker to someone for Zach Britton. I usually value pitching over hitting, but with Walker's 2B position and the potential to hit 20+ HRs this season, I am slightly hesitant to trade him, let alone for a Rookie P on a limited innings cap and the high likelyhood that Britton regresses somewhat over the next few months with his ERA and WHIP. I'm leaning towards accepting, but I was hoping to get some outside advice on the merits of this particular offer. Let's talk it out.

-Thanks