Decent (portrait/indoor) flash for Sony A7

Hiya! Any recommendations for a nice flash for the Sony A7 series?

I currently own an A7iii, but I'm debating an upgrade to the A7iv or A7v whenever it's released. I mostly shoot with my Sony 40mm G, Tamron 35-150mm, and Tamron 17-28mm.

Links to good buying guides would be great, too! (not AI generated slop recapping Amazon's top 10)

Budget is rather arbitrary as long as price/quality is upheld.