Should I use prow or lighthouse?

If you are using a git server other than https://github.com then we recommend Lighthouse.

If you are using https://github.com then for your git server then for now we recommend Prow as it has had more testing than Lighthouse.

Though Lighthouse is our strategic direction. We are starting to incrementally move our open source repositories over to Lighthouse. At some point in the future once we’ve been using Lighthouse in production for all of our open source and commercial repositories Lighthouse will become our recommended solution for all git providers so that we can have a single, simpler & smaller codebase to maintain.