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Pena's last 3 seasons offensively > Gonzalez's last 3.
This doesn't mean Gonzalez isn't going to be better going forward. I'd bet on him being better for sure.
The question is how much better is he really, if at all? And which is the more cost-effective solution?
We must keep perspective though that Gonzalez is a poor fit for the park and Pena a tremendous one. Hitters also typically lose 5 runs in the AL to NL conversion as well.