devtrackers.gg
Hey Captains,
With regards to Unique Upgrades, everyone will prefer some over the others. These unique upgrades are not without some drawbacks, that could be shorter range, slower turret rotation or any number of trade offs. The key is to first learn the ship and how to play it and then determine how the unique upgrade will help you. There might even be unique upgrades that do not fit your play-style or the drawbacks outweigh the positives for you. As Kizarvexis has posted his nice spreadsheet with numbers information.
If I had to choose which Unique Upgrades I would aim for first (personal preference of course).
Yamato: This is easily one of the best Unique Upgrades in my mind. You trade slower turret rotation on slow turrets for better maximum dispersion and reload time. Yes, the reload time is less than using just the normal slot 6 module but the trade off is definitely worth it.
Zao: The Unique Upgrade for the zao is also good if you are good at dodging shells. You get better rudder shift time and maximum dispersion for the trade off of less range. I know it says +8% range but that is half of the +16% you get from the Gun Fire Control System Mod 2. You will be fighting at a closer range (2km closer at best, math could be bad lol) but you get the better rudder shift. The trade off is good but remember to use those WASD keys and vary your speed.
Henri IV: The trade off for this module I feel is almost non-existent. You get detected at a longer range (Henri detection range is already high) for faster reload and more range. There is really nothing bad about this module and I would definitely recommend going for this if you own an Henri IV.
These are just a few that I have gotten or aim to get (don't have Henri IV yet). Again, this is all personal preference and based on the ships you play.
Hopefully this helps and feel free to ask other captains what the recommend.