First, compare the security & features between Windows XP SP2 and Windows 8.1. You'll see most suites are built around to protect Windows XP computers. A few vendors have released specialised software for Windows 8 only, ie. Bitdefender.
So looking at Windows 8.x, it's a lot better than Windows XP, I've chosen Other because I don't believe one requires a Suite to be "better protected" on Windows 8.1.
Out of the box, it comes with Windows Defender (Antispyware+Antivirus) with an option to allow WD to upload suspicious files, Windows SmartScreen (once seen only in IE in Windows 7 and below), Windows Firewall with Advanced Security (highly configurable, without a performance drop), User Access Control that helps prevent unknown changes to the OS. And finally, Windows Updates to help keep Windows secure and updated, WD also uses this to update it's definitions. Those are the basic, but there are other enhancements you can look up online.
This is solely my opinion on the matter, so feel free to use any program you wish.