With 688 you have the ... well 688 only. With Subcommand you have a Seawolve and Akula also. Subcommand is the successor of 688, so generally speaking it is 'better'. And DW comes after Subcommand, with even more playables, even flyable and a frigate. But there are no doubt simulation details that are different. How you handle torpedoes and other weaponry and sensors. As the years past on the simulation fidelity got better, but that is a personal choice as to what feels more real to you.
If you get both, simply play both.
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