Most new boards work with Windows 10's "fast boot", so even if you do it once a day, you are looking at maybe 20 - 30 seconds depending on what CPU/chipset you go with. I personally believe there are far more important features/pros/cons to look at. I guess since I use a NVMe drive, and Windows doesn't usually have many updates where you need to reboot your system, it just isn't a big focus of mine. I generally leave my system up for weeks at a time, and when I do need to reboot it, it happens so quickly I am not impacted by waiting 20 seconds.
I guess at this point are you looking at mainstream consumer boards (Z370, X370) or you looking a pro-sumer boards like X299 and X399)?