SW, armor makes you slow and means no room for bulge with subs, SW means you can dodge and fit a lil bulge.
Also, more firepower with SW, and is better training for QV.
Best way to run UK is with 4 reps, 1 seaman, 5 engies (no need for AA or HH)
Follow the suggested thread but these are your main points.
For SW set up, put .3 belt and 2 bulkhead to nerf torp damage and stop crew death.