86 OPS+ vs 87 OPS+ so technically yes Austin Martin was better, and he might very well hit a little bit better this year too.
Yes, Austin Martin is not going to suddenly become a good defender just because he goes from 1,000 innings in the OF to 1,200 innings in the OF.
He wasn't just learning the position as so many here want to claim in order to excuse how terrible he was out there.