When comparing trizen vs Pakku, 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 Pakku is ranked 10th. The most important reason people chose trizen is:
It's very intuitive and has a pacman-like syntax.
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Pros
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.
Pro Auto removes build dependencies
Has option to auto remove all unused build dependencies.
Pro Wraps pacman
Installation or updates of official or aur packages can all be done with pakku.
Pro Uses pacman interface
Easy to use for anyone familiar with pacman.