the Neutral DD01-M1 is my favorite destroyer. But you have to expend an entire crew through Level 24 to get the good guns. I have a set (4) of neutral sailors at L40 now specifically for my Neutral ship lines.
WIth the DD01-M1, you can load up the L24 6" guns and enough ammo to pull down 10K++ in a blitz.. Those 6" guns have range better than most CLs and some CAs.
Also the FF-Y is my favorite ASW ship, with four racks of depth charges, mount up the dual 3" 70MM guns, put a sonarman on board and go hunting. Fast and maneuverable.
The FF-X is the bulldog of FFs and packs a pair of nice torp launchers and a trio of gun settings on the rear to let you exploit the "shoot and run" tactic.
FF WARS RULE!
PS: they're just baby battleships anyway.