[kapitan z.s.]

The only one I own and I just got it is sh5, so far i like it, but everyone screams how much better sh3 and sh4 are. I like the atlantic theatre better from a historical point of view. But i would also like to try the ship mod in some of the older sh, i hear so much about. Can anyone tell me the differences between the series? Pros and cons or just opinons. Thanks