To be fair, I've used both w/ very little unexpected (
cough, Linux) issues.
On OSX, practically no issues. A few system crashes in 10 years, and some very rare issues w/ keyboard/input (I think it's my company's mandatory security software...) The GUI more than makes up for any perceived cost issue (as much as I'd like them 500-1000 cheaper) and the available apps are generally 2x better than Windows and 10x better than Linux.
On Linux GUI, there are a lot of expected problems w/ drivers and such which you can work around with research, but you still end up occasionally having odd audio/graphics issues. X windows is antiquated and holds back the. Gnome/Tk are mediocre replacements, and the other options more so. Some people like twiddling/fighting to get their system setup properly, but I left those feelings 16 years ago.
On Linux server, practically no issues, effectively 100% reliable under most conditions.
OTOH, I know plenty of people who have recurring issues with their Macs, but I attribute it to them not really knowing what they are doing (this includes my wife on our shared MBP)