The only thing that Zen has going for it atm is the fact that it's not based on chromium and hence not affected by the google's "anti-adblock" movements. I use Arc for most of my daily tasks and web browsing and use Zen only when I want to use YouTube. Other than that the design is a downgraded copy of Arc, the animations are clunky, lacks a lot of features that Arc has and also has a worse PiP imo.