I have been testing Ubuntu Distros including Zorin and a few others (Linux Mint, Kubuntu, Ubuntu Mate, etc.) and they all have issues with flickering during boot and system instability.
I also tried Debian distributions (Debian, LinuxMX, Q4os, Deepin) and in these I have no problems of any kind when booting the system, but in these distributions I do not have animations in the system of any kind, and the resolution is not adequate
for example Deepin and UbuntuDDE, both are exactly the same but Deepin is based on debian, in Deepin I had no problems when starting the system, but I have no animations and the resolution is lower than what my screen actually has.
In UbuntuDDE if I can put the appropriate resolution and if I have the Animations, but I have eternal flickers when starting the system and Instability (As in Zorin)
If there is a grammatical defect, it is because I do not speak English