What top rated bookkeeping services in the US do startups use for their taxes?

Early stage start up. We've been handling bookkeeping ourselves for a good while to keep things lean. After closing a successful fundraising round recently we can now afford to outsource this while focusing on growth 🙂 Any hidden gems we ought to consider? It's very early days on this, but we've already looked through Pilot, Bench and Haven. Currently leaning towards the latter just based on responsiveness.

Thoughts would be the best path forward, and how would you go about validating a bookkeeping firm?