The Zeus is the most versatile design of the two. Superior gunpoint placement indeed make it a better dogfighter, while split primary banks give it a flexibility in the battlefield that the Artemis sorely lacks, and it notes.
That being said, the Zeus really starts showing its weaknesses as a bomber in higher difficulty levels. Also, it's worth noting that I have a strong bias against the Artemis, and I feel like I have to be very honest about that.
I always wanted to like the Artemis. The problem is, it has poor gun placement and maneuverability, the two most important dogfighting statistics.
You know, it seems like almost every strike bomber has a crippling flaw: The Artemis has crap gunpoints and maneuverability, the Athena can't carry real bombs, the Zeus can but it has much worse payload and weaker armor.
The Bakha and the Sekhmet are the only exceptions I can think of, being fairly good in an anti-capital and anti-fighter role. In particular, the Sekhmet is both the strongest and most maneuverable strike bomber in the game. It could easily be used as a heavy space superiority fighter instead of a bomber.