Kali has a built-in advantage due to its popularity, meaning that tutorials are available around the internet K and many penetration tutorials assume that you’re using Kali. This helps when you’re first learning to use the distro. Being a well-known distro means that external resources such as the Reddit subreddit (r/Kalilinux) are extremely active.
There is an official Kali forum. It has moderate activity and suffers from having too many sections. However, it looks as though every question that’s posed gets a reply. A search for Kali Linux on YouTube reveals dozens of videos and some complete training courses.
The Parrot Security official forum has similar levels of activity to that of Kali, but the layout is better for a moderate traffic forum. As with Kali, posts always seem to receive an answer. YouTube showed a few videos that mention Parrot Security, and the Reddit subreddit has a low but steady level of activity.