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.
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