I don’t think dual boot has ever been a good solution (unless you also run one or both of the OS’s under the other in a VM).

Like, if you are unsure about linux, trying it out, learning, whatever, you can just boot a live"cd", or maybe install it on an external (flash) drive.

If you are kinda sure you want to switch, just nuke Windows; it’s easier to switch that way than to have everything on two systems, having to switch.