Not to be a smart donkey - but why choose? I'd rather have them both, which we do. Both of these guys can play.
I guess I see what you're saying - as far as versitility goes - but Yan is damn good. He's right out of that Javi Herrera, Dennis Gomez, AM Suarez, JP Arencibia mold - a tough gritty competitor. Lock's pretty special, too. I'm sure the Helton comparisons will be made often the next few years.
The future looks bright with these guys poised to take over for JP, Julio, and James going into the future.
Go BaseVOLS!!