I found the pre-dreadnought conflict mission the most fun by far and would love to see more missions along those lines, and, in general, I enjoyed earlier tech a lot more than later tech
The limited abilities of ships really mean that you have to make the most out of every ship in your feel so it's a lot more about planning, positioning and picking the right targets while the later missions really just come down to sniping the enemy from 25km away with laser accurate 18" guns.