When comparing Yaourt vs Aura, the Slant community recommends Aura for most people. In the question“What are the best AUR helpers for Arch-based Linux distributions?” Aura is ranked 4th while Yaourt is ranked 5th. The most important reason people chose Aura is:
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.
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Pros
Pro Equivalent to pacman
Yaourt commands and flags match pacman, so it is immediately obvious how to use it.
Pro Colored output
Pro Adds seamless access to the AUR
Pro Can be set up upgrade your system with no additional prompts
Pro You can adapt PKGBUILD to your needs during the (pre-)installation process
Pro Supports backups
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.
Cons
Con Insecure
More information here.
Con Not maintained anymore
According to the Wiki page of Archlinux, Yaourt development is stalled.
Con Does not perform clean builds
Environment variables may get carried over while building a package, preventing successful building.
Con Bad split packages support
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