I've been swapping between my AMD and my Intel cpu and mobos quite frequently over the last few months, and I kept meaning to do a fresh Windows install. I usually plan to do it once I know the hardware is stable. Thing is I rarely get around to it as there doesn't seem to be a need anymore.
Windows 10 seems to be good at keeping everything stable, it autodetects the change in hardware at the first startup and does it's magic. Obviously if there were glitches I'd be fairly quick to do a fresh install, but if everything is running perfectly I don't see the point.
I'd be happy to listen to other peoples recommendations, thoughts and experiences though, and take them into consideration.
And I'll obviously uninstall specific applications that are no longer needed.. You don't want your old ASUS AI Suite software running every time your new Gigabyte board boots up!