Apple has complete control over both the hardware and the software that Macs rely on to be the appliances that they are. Microsoft, on the other hand, has a more flimsy hold on the quality of the hardware and software that runs on PCs. The average Mac is more stable than the average PC. This is an undisputable fact. You can almost always find a PC that is more powerful than a Mac (for less money) and it may remain about as stable as the Mac, or it may not, usually depending on malware.
The question of whether you should switch to a Mac from a PC comes down to two main questions: (a) Is the higher price of the Mac worth it? and (b) Are you fed up with all the inevitable problems that come with using a PC? Macs are not without their specific problems and annoyances. Some of the most expensive Macs have severe hardware problems and all Macs are intentionally built to be difficult to upgrade or repair.