If you do go with just the splits, Clippard does win out even with his elevated numbers vs. right-handers this year.
What’s interesting is that Clippard has always had practically no split, but he’s still good against right-handers for his career because he’s generally a good pitcher.
Clippard vs. LHB, 2015: .100/.250/.125
Clippard vs. RHB, 2015: .250/.321/.417
Clippard vs. RHB, career: .196/.282/.357
But Pomeranz’s numbers may also be affected by his severe second time through the order penalty. Considering how effective he was against his first batter, and how you still have to shepherd Clippard to the end of the game if you bring him in at that moment.