The critical high-level stats are pretty close.
Run Differential: +229 vs. +196
OPS+: 112 vs. 109
ERA+: 117 vs. 115
But, the Red Sox postseason starters have been significantly better than L.A.'s, and the closer is a lot better. Plus, Boston actually played slightly better than their run differential would indicate they should have performed, whereas the Dodgers were 10 games worse, which usually indicates a significant mismatch from a strategic/coaching standpoint.
I also can't ignore how well Boston handled Houston, while L.A. had to go to the wire with Milwaukee. I'd say Boston in 5.