I always fight Bish 'cause I never get kills when I fight Nits, no matter how many pings I put into a target. It's karma. I mean it! Check this out:
One night I upped against the Nits, and on one sortie scored lots of hits against enemy aircraft but only got 5 assists out of it, no kills. The very next hop I go fight the Bish, and right away I get a proxy kill on a Bish Typhoon shot down by auto ack. I never even fired my guns (later on that same hop I got clean kills of a 51 and I think a N1K).