Slice personally my heart lies with Sandstorm, but tea. Even though her newer skins LOOK the best, they are kinda the worst LOL idk maybe the nostalgia in me is why I love her old ones...
lol ive been using battle queen quite often mainly because of the sword effects(like how you can change them after a few kills). but idkkkkkkk i can't pick. though red card is definitely fierce, like slice said when i do feel badass id like a mercenary one too.
My order would be
Battle queen
Blood moon
Mercenary
Red Card
Sandstorm
Project
Etc.. the rest based on seasons i guess. But I really have been neglecting my old kat skins :(