Originally Posted by To be

I'd encourage you to use both and see which suits you (or just use both in general). 'Realism' is hard to compare because all the real data on modern navies is a closely guarded secret - and there have been very few examples of modern naval combat. The RA mod is a bit more difficult to use because it changes weapon employment, etc but if you keep the manual at hand that shouldn't be hard to overcome, and it ultimately results in a richer experience. Weapons effectiveness varies greatly between the two mods. especially so called Lightweight torpedoes. In LWAMI, 1 LWT will sink almost any sub, whereas in RA some subs can require 3 or more hits to sink. So depending on which in your opinion is more realistic, that could likely determine your choice, if realism is key for you.