Theres a bunch of figures out there, and in my view a crew is a must to make your boat look lived-in and ad a sense of scale - even if I hate painting figures in that scale
When I turned my attention at subs I bought a bunch of figures consisting of CMK, Preiser, Warrior, Andrea and Heckler and Goros - my opinions are (mini review in progress ...
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Warriors - Resin - my favorites, good scale representation, nice poses, qualitycast and good fit and level of details.
CMK - Resin - wide variaty, allmost as good as Warrior. an little more unevenly cast, but generally high quality.
Preiser - plastic - nothing beats the price, I use the luftwaffe sets - fair quality but softer than Resin kits. You can mix the parts and create a unique crew for your boat. Some figures is un usable due to the uniforms and equipment - give them to somebody who does 1:72 planestuff.
Andrea - white metal - good selection of poses, but overscale and my sample showed sloppy casting - somewhat pricy compared to the quality.
Heckler and Goros - white metal - again good selection of poses and a better casting quality than Andrea, personally I find the figures a bit "beefy" - crew would not be that fat in the 4.th. war year
Revell - soft plastic - better not spoken about ....
Cheers/Jan