My vote goes to either Glyber Torres or Anthony Volpe. I'm sure yours will go to a couple of Dodgers!
I'd say Muncy could be a candidate. For guy with his power he's as patient as anyone at the plate. Doesn't swing out of the strike zone very often. Kike Hernandez has a history of homers in clutch situations. Will Smith is due for a breakout. He's usually good for around 25 homers a season with a BA of around 270. He had a rough second half and his numbers went way down.
I wouldn't overlook the rookie Pages. He had a 2 homer game in one of the losses. Looks like you'd pronounce with the G but its pronounced with an H. Pa-hez. I imagine there will be some platooning with Taylor and Lux. Doubt one of them will be a surprise star.
I'm pretty sure the Yankees have an edge with the starting pitching. The Dodgers only have 3 starters. They've all had good games. And they've all had stinkers. Its anybody's guess what they will do in this series. Unless there is a sweep there will likely be at least two bullpen games. That has worked well for them so far.