I'm not making this an either/or. We can use Cola against LHP and Smoak against RHP. Ride the hot hands.
Smoak is pull happy on the ground. You are correct, and because of that the shift will likely keep his BAPIP at .250. That's been consistent with him all career.
I do think Cola's .410 BABIP and .380 wOBA are unsustainable, although I agree because he does go the other way his BAPIP should be higher than Smoaks. Not that big of a spread though.
Their K % is virtually dead even now at 27%.