Install drivers from Dell.com - System Software first, then chipset, then any other applicable drivers - Windows Update will offer you any drivers for your specific hardware that are newer than what you have installed.  In MOST cases, this is just fine.  If you do notice any issues, just uninstall/rollback and hide the update.  I've only seen a bad Windows Update drivers once on the 150+ workstations and a dozen or so different models I manage.
 I have obtained the drivers for my XPS 15z from here [URL] , but WIndows Updates offers driver updates for various devices. Should I install them?
Drivers From Windows Update