Better stack or change job first ?

I work on a stack that's not too great. I have the option of moving internally to a team that uses a better stack or to just move to another opportunity altogether. Is the latter going to be harder ? Is the former worth the pay cut ? When compared to a gain from making a switch . TC: pretty bad Current stack : pretty scoped to proprietary architecture with not much scope to learn Stack on internal team I'm considering moving to: horizontally scalable with a lot more room for growth.