Installing closed-source software from third parties always is a bit cumbersome on Linux. The distributions have their systems, but other vendors just throw DEB packages over the fence. I had used Flatpak for a while, but now I've started to use Snap as well and am delighted.
First of all, I find it quite pointless that Linux users argue indefinitely about the "best" Linux distribution. There are different aims in every Linux distribution and therefore some significant and subtle differences. The question is "Which one is best for my purposes?" than to ask a for a "best" distribution in general.