So if I understand correctly the FC planes are the ones that are the easiest to learn? I don't really have the time to learn the startup sequence of the planes and the in depth radar modes. I like the way it works in war thunder where you can set the range and the modes with the on screen menu instead of trying to click knobs and buttons.
Most everything I've flown always has an autostart key mapping (WIN+HOME). You still have to wait while it does the startup. Various servers and missions can also allow hot starts if you want.
FC planes have a simplified FM and systems implementation. They are popular. For casual fun they are probably better and cheaper.
The full fidelity planes are museum-grade, digital replica's or as close as anyone has created. You can see where the cost goes if you want maximum detail. If you really want to learn how an aircraft actually operated, and get a direct feel of the workload of these young pilots, then a full fidelity model can be rewarding. It's the closest you will find of actually owning one and have it sitting at your local FBO fueled up and waiting for you whenever you wanted to take it for a spin.