I think that SC with SCX is the most accurate. given what I have readed so far here and in other forums. This all is however just plain guessing in most aspects, since the REAL performance of submarines and their sensors is obviously classified stuff :hmm: Having said that, I think that DW with LWAMI offers a great gameplay and realism feel, and I have both SCX and DW side by side in the hard disk
If you have to choose one and other considerations (Price, PC power...) don't matter, I would pick DW for the improved multiplayer and new platforms.