It's heart warming to see the DW love. With all the hate the series gets it's good to see more fans.
I never played it in a meta way, so i don't really know whats best per se. I just tend to have an easier time with characters that have large sweeping horizontal attacks. I used to really enjoy Fu Xi, until Guan ping took his move set. But they have progressively made him worse with each game. I really enjoyed the spinny musou.
I also enjoyed the old Gan Ning with a sword alot more than the redesign. He used to feel more pirate-y and fun to use with that high mobility musou where you cut down enemies in a line. Wish they brought that back for him.