What are the ports on each cruise? That would be among the deciding factors for me.
Yes, expect cooler temps (50F) and rain in November. We went in April when the temps were in the 50s and it was quite comfortable. Then again, we're from the northeast U.S., so this wasn't so bad after winter. September is warmer, but not hot like in the summer months.
Still, I'd be looking at the ports.