Apologies in advance - I'm sure this has been discussed before but... OK, no excuses, I just can't be bothered searching (or doing the maths myself).
What's better, four attack dice and one action (say, focus) or three attack dice with focus and target lock? I'm trying to decide whether Opportunist is worth using instead of Push the Limit, assuming you don't get the extra action any other way and assuming you get to use opportunist.