I've been using and building PC's since the 1970's, so I'm probably not a typical user. I would say the best things about a mac are:
- The physical design, i.e., aesthetics
- Apple's success at creating a cult of evangelical users
- The Operating System, which is not to be confused with the Graphical User Interface
- Closed ecosystem
- Customer Support at Apple Retail Stores
To expand on some of these advantages:
MacOS is a UNIX derivative operating system. If you are familiar with UNIX, Linux or BSD you will be right at home in the Mac shell. UNIX has long had better security and privilege controls than Windows, although the difference today isn't as significant. This is one of the reasons why there's less malware targeting Macs than Windows, the other and more important reason being size of the potential target audience. But today the real security difference comes down to default user privileges and user education. If you were constantly getting malware on your PC before switching to Mac then you better learn how to protect yourself; as Mac popularity has increased, so has the number of Mac viruses.
Mac's closed ecosystem results in a trade-off between much lower compatibility problems and higher prices. The situation is nowhere more profound than on the current generation of Macbooks, which are essentially sealed systems with no user-replaceable or -upgradeable components; not even memory or disk. But in a world where few people venture under the hood of their car, being freed from tinkering under the hood of their computer is worth a premium. And if that extra cost comes along with less performance options, well, it's easy to convince yourself the same software runs faster on a slower Mac than on a faster PC, particularly when you don't have the two side-by-side for comparison.
Apple's customer support and Apple Retail Stores go hand-in-hand to provide a great experience for customers who live within easy travel distance of an Apple Store. Outside of in-store support, both Mac and most major PC brands rely on remote screen control, non-destructive OS re-install and mail-in service. You have to pay extra for anything other than baseline hardware warranty support for both Mac's and PC's, though on PC's this usually lasts a year versus Apple's 90-days.
However, in certain aspects the support options for PC's is better than for Macs, as you can add accidental damage protection, in-home service and up to five years of support rather than Apple's three years.
I have a desktop (tower) and three laptops I use regularly. The desktop is a 5 year-old i7 and dual-boots Win10 and MacOS 10.12. Yes, it's a hackintosh. The only thing I've done with it in 5 years is add a 2nd SSD, upgrade the graphics card and install Windows 10. That's my main system. Then I have a 4 year-old Dell Latitude laptop running Window 7 for my day job, and a mid-2015 Macbook Pro split 50:50 between my day job and photography/video. Finally, I have a 4 year-old Toshiba Portege ultrabook running Windows 10 that I use when traveling. I've never had malware on any computer. I don't have trouble with systems slowing down. And I don't feel compelled to upgrade anytime soon, either.
The pace of hardware innovation has slowed considerably since the 1990's, when IBM started divesting itself from the PC hardware business and the rest of the industry became more price-focused. Even processor advances have become less dramatic. SSD was the last revolutionary improvement. Now graphics cards, displays and VR is where the big advances occur, though they are still evolutionary. We are overdue for a new, disruptive technology on the PC by 10 years. I thought the Surface Pro was going to be that market revolution, but high cost and patents seems to have held it back. Now I think that smartphones are the disrupting force. Just as with cameras, the best computer is the one you carry with you all the time. For the average person, a smartphone is now their primary computer. They use it to browse the web, read email, pay bills, watch movies, play games. VR is moving from the big box to your palm. How long before photo editing, video editing, CAD and other high-compute applications follow?
Five years from now we'll still be having this kind of debate. But instead of which PC platform is best, it will be PC vs smartphone.