Today Next.js has a big advantage which is that they have already integrated most of the new React 19 rendering features and apis. I think it will take a while for Remix to catch up to that.
Other notable frameworks are community led Waku made by Daishi Kato from Pmdrs and TanStart made by Tanner from Tanstack.
Also there's Redwood.js betting on a more integrated experience.
Today I am using Nextjs because I don't think I can go back to not using RSCs, but when Remix catches up or Waku and TanStart get to v1, I sure will give them a serious try!