[exogen]

AVA is great, I use it on a few projects and even developed a simple HTTP record/replay add-on for it. I'd say it's good for smaller projects.

One huge benefit of Jest though is the built-in mocking, including module mocking. This stuff is BYO in AVA. Module mocks in particular can be quite annoying to set up, so it's really nice that Jest pulls them all together in one cohesive package.