Who should I use between the URs that I've got?

(name and stars)
Dragon of Echigo (1)
Demon King of 6 (1)
Luis Frois (0)
Taikou Hideyoshi (0)

Right now I'm using:
Dragon of Echigo (1) Ninja
Date Masamune (2) Elite crimson rider
Mori Motonari (1) Marksman
Taikou Hideyoshi (0) personal guard
Kuroda Kanbei (3) Artillery

Luis Frois is tempting, and I want to make demon king work, but she seems bad with the musket/cannon dmg reductions, and her skill seems hard to make proc.

I've also got almost all the SSR's and SR's to choose from.
Thanks.