Windows computers are more prone to viruses, but people are starting to target Apple computers and iPhones/iPads now because they're becoming more frequent. I'd say just about every college kid I see now uses Apple computers.
The biggest difference is that, while both have anti-virus programs, Windows constantly pushes out updates to prevent large scale virus attacks. Apple has had large scale virus attacks before, but Apple's company policy is that their computers are immune to viruses. Hackers are going to start targeting Apple more because their market share is increasing. Apple computers don't "don't get viruses" because they're immune to viruses, they "don't get viruses" because nobody uses Apple computers until recently, because apparently the college students at the schools I went to have more money in a recession without a job than I had in a good economy with a job. These are the same idiots out in New York protesting the wealth inequality while typing their blogs on the most expensive laptops and phones on the market.
As for hardware problems, I've never had a good experience with Apple. Magnethead is doing a great job selling Apple products here, but don't expect good support if you actually buy one. My iPhone has been broke for over a year, crashes and everything. Apple refused to acknowledge there being a hardware issue. They hooked it up to a machine for five seconds and said it was fine and to reset the phone. I did and I still had problems. I talked to several Apple worshippers about it and they've all told me that it's a user error. (This has always been my experience with people who use Apple products, that Apples are perfect). I've since discovered the problem and Apple wants more money than the phone is worth to fix it.
If you do have to replace hardware in it, it's going to cost a good fortune -- probably more than the total cost of a high-end Windows laptop. Contrary to what Apple people say, the hardware is the exact same hardware that goes in Windows laptops. Apple hardware is built by Intel and FOXCONN. Intel hardware is reliable, but your hard drives, CD drives, etc, they can fail.
Apple operating systems, while powerful, can have the same problems as Windows. Again, the big difference, you're going to get support from Windows.
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My school is always pushing people to uses Apples. Half they time if you have a computer issue the tech department can't fix it because they only have people who know Apples. Me I'll never own on because I've hated them since my elementary school had them I just do not like how they are set up.