Welcome to the forum @razaigon! Glad you are enjoying the Mega Bezel
Hmm good question, the things that can sometimes suffer at 1080p is if you get moire distortions/artifacts on the screen when using curvature or possibly uneven scanlines when not using integer scale. Also the lcd shader can have difficulty at 1080p in top/bottom layout.
If you are getting the moire artifacts you can reduce the curvature.
For the uneven scanlines or lcd artifacts at non-integer scale this is really just a resolution limitation.
I definitely think it’s nicer on higher resolution (I regularly run it at both HD and 4K), this is partly because by its nature the Mega Bezel makes the screen area smaller on the monitor so the more pixels you can give the screen area the better, and any moire is reduced,it also gives you more flexibility with what masks in guest-dr-venom can look good. If you use any of @Duimon’s presets and art they really look fantastic at 4K.
One thing to keep in mind is the gpu requirements for 4k are about 4x what is needed for 2K. I have a Nvidia RTX2060 and I get about 90fps with the ADVANCED preset at 4K.