Today at work my PC was installing Windows 7 upgrades and was stuck at 15% for over an hour. I resulted to restarting in safe mode to cancel the instal so that I could get some work done.
Tonight I have installed OS Sierra on my 7 year old iMac. It installed the new OS, with no issues, in 40 minutes and it was free to upgrade.
No stuck instalation, no constant security patching and no cost. You don’t get that with Windows.