Two catchers, two very different ways of providing value.
Piazza stakes claim to the best hitting catcher ever, but he was generally below average behind the plate.
In the early part of his career, Pudge saw most of his value come from his glove (and more importantly, his arm) while his offense lagged behind.
I didn't realize how quickly Piazza's value dropped, nor that Pudge was so valuable so recently.
WAR data from Baseball Projections.com. All data relative to average, except RAR.