I like windowed fullscreen.

Windowed Full-screen is pretty common. Not all games support it, do then regular full screen.

In the early days if windowed full-screen sometimes classic full-screen just worked better. These days classic full-screen mostly for aged games, or the odd bug or compatibility issue. I think anyway.

All of these are the same but I use fullscreen with gsync so there is no backround render, it you want to alt tab quick use borderless or windowed fllscreen

It depends on the situation. if you're trying to look at percentages utilisation of your hardware then windowed is helpful. otherwise fullscreen all the time personally. I never understand how some people can go windowed and multitask other things while gaming.

I mean yeah maybe if you're afk farming or something but if its a game that requires your focus, why would you split your attention on other things?

Also I guess multiple monitors explains some of that. never had multiple monitors my self, seems weird to me and like it would take some getting used to.