I find playing with a pick to generate more highs in comparison to finger style, which to me is a warmer sound.
I’d stick with the same strings to start and see where you go from there, you know you like them and they’ll feel natural to you when learning the new technique.
For myself as a confirmed pick player I prefer steel rounds, for years it was Rotosound 66, then Warwick Red Label, have settled with Elixirs, they feel great, sound great and last a long time.