Help choosing SH3 - 4 or 5

[macjim]

Not sure where to post this.

Which game to play?

I am undecided which game to play.

Priorities;
Immersive - I like to feel like I am in the sub or on the deck. Marulken is great.
Stable - I loaded up SH5 in March 2015 but the crashes removed my enthusiasm.
Realistic navigation - To NOT see where my sub is on a map is great. A big part of the fun is tracking where I am based on my course, speed, the currents and time. Having a magic location icon on the map is not good.
Missions- Atlantic. Like having a large theater to operate in and being able to save the game to return a play later. I'm not fixed on historical accuracy but enjoy the rarity of a sighting rather than a very target rich environment. A campaign would be nice.

Suggestions? Explanations?

Can someone please move this thread if it should be posted in a different location to get more exposure. Thanks.