When comparing Yaourt vs trizen, the Slant community recommends trizen for most people. In the question“What are the best AUR helpers for Arch-based Linux distributions?” trizen is ranked 2nd while Yaourt is ranked 5th. The most important reason people chose trizen is:
It's very intuitive and has a pacman-like syntax.
Ranked in these QuestionsQuestion Ranking
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 Easy to use
It's very intuitive and has a pacman-like syntax.
Pro Being written in Perl, trizen has an extra level of security over bash as well as performance and power benefits inherent to Perl
It is written in Perl in a functional-recurisive way, featuring full AUR dependencies support.
Being written in Perl (or any other language, except bash), it means that it can't execute/source (silently) the PKGBUILD to get information for a package, which guarantees an extra-level of security. Other benefits are the performance and power that comes with Perl.
Pro Lightweight
It's written in Perl instead of Go that makes it so lightweight.
Pro AUR comments, search and upgrade support
It can display comments for AUR packages, search for AUR packages and check for AUR package updates.
Pro Secure
The PKGBUILD is not executed before it is displayed to the user and optionally edited.
Pro Availability
It's in the Manjaro packages.
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.