SH3 with mods and all the nice stuff provided by all the community, is a lot better than SH4 with mods. I donīt play SH5.
SH3 has a level of immersity not got by SH4. SH4 lacks of candy eyes mods (harbours, islands, people, etc.). Depart from a german base in SH3 and you will have band, nurses, flowers...atmosphere. Departing from Pearl Harbour, with the best mods, is really boring.
In SH3 you can have a lot of ships and you can add more and more, for diverse countries. Also in SH4, but the process is more difficult because the structure of layers of the campaign files (and it is a frequent cause of CTDs).
Never SH4 had a GUI as OLC, MaGUI or Anhenerbe GUI. The Monsun GUI for SH4 is a nice work but when you see and play with some of the great GUIs for SH3, you can become depressed.
Respect the campaign in Op. Monsun, Lurker declared in the manual the convoys lack of all the ships needed because of the limitations of the engine. That is: the convoys havenīt the historic quantity of ships. Not good for me.
Regards.
Fitzcarraldo