SnowPack is more of an all-in-one kind of tool (with dev server, HMR, etc.). Also it uses esbuild internally :-)

https://www.snowpack.dev/guides/optimize-and-bundle#option-1...

Snowpack is a bundler, not a build tool. It works with a variety of file formats, and it uses esbuild to compile JS/TS assets.

Snowpack uses esbuild internally now, there's a good rundown of it and other awesome snowpack features like streaming imports in their 3.0 release announcement: https://www.snowpack.dev/posts/2021-01-13-snowpack-3-0