catch2 has become fairly bloated. doctest takes all of the best parts of catch2 without all the bloat and the end result is a test framework that is literally over 10x faster than catch2. It's also like 90% compatible with catch2 so porting your tests to it is pretty easy.

Especially if you have a build process that always runs your unit tests, it's nice to have a very fast test/compile/debug loop.

https://github.com/doctest/doctest

I was just about to suggest doctest, you beat me to it! I'm all about faster compile times, and it was mostly a drop-in replacement for catch2 in my case.

Also, IMO, both doctest and catch2 are far superior to Google Test.