When comparing eopkg vs yay, the Slant community recommends yay for most people. In the question“What are the best Linux package managers?” yay is ranked 8th while eopkg is ranked 17th. The most important reason people chose yay is:
It's written in Go so it is fairly easy to add features or tweak this amazing tool.
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Pros
Pro Excellent rollback and repair features.
Can easily rollback if an update goes awry. Can also choose to check all installed packages and repair them, instead of just repairing or reinstalling individual packages.
Pro Simple syntax
Pro Easy to add features
It's written in Go so it is fairly easy to add features or tweak this amazing tool.
Pro Intuitive CLI
Yay's commands and output make sense for anyone used to the pacman package manager.
Pro Written in Go
The compiled program is snappy while the source is easy to read.
Pro Available as a precompiled binary
Both yay and yay-bin are in the AUR, the latter of which doesn't require any dependencies or compilation, making installation and updates quick and painless.
Pro Yogurt interactive mode
Write package name without keys [yay <packagename>] to enter interactive mode.
Pro Doesn't rebuild already-installed apps like Trizen
Cons
Con Not powerful
Con Written in Go
Running a Go program requires the Go runtime. Go is also a garbage collected language, so the program isn't as responsive as it could be.