When comparing Aura vs yay, the Slant community recommends yay for most people. In the question“What are the best AUR helpers for Arch-based Linux distributions?” yay is ranked 1st while Aura is ranked 4th. 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 Written in Haskell
Since the application is written in Haskell, it means that, unless the author went out of their way to subvert the type system, at least some classes of bugs must have been eliminated for the project to even compile, and so at least some basic level of stability is guaranteed.
Pro Similar syntax to pacman
pacman -Ss ghc
aura -As ghc
Pro Run as Root, Build as a User
makepkg gets very upset if you try to build a package as root. That said, a built package can't be handed off to pacman and installed if you don't run as root. Other AUR helpers ignore this problem, but Aura does not. Even when run with sudo, packages are built with normal user privilages, then handed to pacman and installed as root.
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 aura is difficult to use for system upgrade.
sudo aura -Syu
searches for .sig files for each repository.
.Sig files are not used with pacman
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.