4 is the best IMO V1.5 , best mods, play more than just the US side,Couple of great german mods, Great US mods, Japanese, British, Italian, even Russian For the life of me I can't figure out UBOAT and Silent Hunter 5 is just terrible too.
Here's my list number in front of them is my rating from best to okay, there are several others I left out of the list that should be in there. Almost all require V1.5 of Silent hunter4, You can usually get SH4 and the uboat add on(V1.5) for $10 each on Steam. If you need help using multiple mods let me know and I'll hunt up my detailed method how I have them all running on win7 and win 10
4. TMO Realism and graphics quick death for swabbies
https://www.subsim.com/radioroom/sho...d.php?t=250635
3. TMOwTW Realism graphics and better chance of survival
https://www.subsim.com/radioroom/dow...o=file&id=4801
1. Darkwaters German perspective Realism and great graphics
https://www.subsim.com/radioroom/sho...ght=darkwaters
2. FOTRS Realism and graphics
https://www.subsim.com/radioroom/sho...d.php?t=243064
5. Japanese Mod Vanilla graphics, Japanese subs perspective
https://www.subsim.com/radioroom/sho...d.php?t=137761
6. We dive at Dawn British sub perspective vanilla
https://www.subsim.com/radioroom/sho...d.php?t=170639
Hopefully soon this new WWI mod for SH4 will be coming out too, should prove to be one of the best if not the best ever for SH4
https://www.subsim.com/radioroom/sho...d.php?t=156161