Silent Services (the first one) will always have a special part in my memories, it was the first time i played with a submarine game, i had it on my amstrad cpc464, i believe i overused the tape
.
It was not the best version (the C64 was said to be better), but i had plenty of fun diving and releasing junks trying to get my pursuers thinking i was destroyed.
But that said, Silent Hunter was better because it was going a lot more to the simulation way, while Silent Service was more simplified, and i doubt it was because of the difference in age, just look at Red Storm Rising that despite being 7 year older than SH even today on my dosbox i find it awesome.
I never had Silent Service 2 though, maybe one day i will try to find it for dosbox.