It depends. You also have to decide if you want to use LTO or PGO or similar techniques to further boost performance (but massively impacting compile time).
Generally Gentoo ‘feels’ smoother than other distributions. And I had an old netbook that used to be unable to play HD content on Ubuntu and the like, but HD content worked smoothly on Gentoo.
If you are happy with the distributions you use, there is no need to try Gentoo.
In my opinion, as a Gentoo user for the last 20 years, Gentoo is the most flexible distribution there is. Gentoo can be as stable as Debian or it can be as (or even more) cutting edge as Arch. Or it can be anything in between and you can even mix and match as you like.
The cost you pay for that flexibility is the compile time it takes to build the packages. And Gentoo is even providing you with prebuilt binaries for a very large amount of packages.
Package install doesn’t mean you have to read compilation instructions and edit configs. Usually you just install like in any other distro. (Except it takes a bit longer to finish.)
Tried LFS first. Stayed with Gentoo after for the maintainability.
What year is this? 2008?