I've found Wayland works ok on most of my laptops but not at all working on my desktop that has Nvidia graphics

Works fine on my 3060. I've been on COSMIC for nearly a full year, and it's been a wonderful experience. Make sure you're using a driver version above 560 (or explicitly go with 575 if you use gamescope, as it fixes a Vulkan bug), and make sure that you're using a desktop environment that properly utilizes explicit sync. Wayland on Nvidia is abysmal without those two factors, and you can check if explicit sync is in use with Waycheck. It lists all of the protocols your DE supports. I don't remember explicit sync's specific name off the top of my head (it's something like objsync_v1), but just filter by the term "sync", and if it shows up in bold letters, that means it's in use.