Comment by streptomycin

The initial selling point was performance, but then they gradually realized that a lot of the slow cruft in Jest was necessary for correctness, and now it's about the same performance as Jest (obviously may vary in some specific situation).

However vitest is still great! Selling points now are stuff like:

- shares config with vite

- works with ESM out of the box (I think Jest still doesn't)

- integrated browser testing mode that is very nice

- overall just has a ton of nicely integrated features