I like the Angels because Perez is all over the place. He walks a lot of batters, and is very erratic. However, Garland has been hit hard this year in most of his games. Even when he keeps the runs low, he still gives up a lot of hits.
Personally, I'm on the Over. I'm pretty sure the Angels will put runs up on Perez, taking advantage of his walks... but I'm not confident enough in Garland's stuff to take the LAA. Over for me.