your money, credit card, your friend contacts, your data,... whatever Microsoft or Apple can steal from You.
I use Microsoft products, Apple products, and products by pretty much all major computer companies. Going way back: I still have two machines made by "Digital Equipment" in my house (they only get booted roughly once every ten years). I don't think there are any Jupiter Networks in my house, but at times there was Cisco hardware here too (a small ISDN router).
And none of them have ever stolen my money (I give it to them voluntarily), my credit cards, or my contact list. I don't think I've ever seen any of the people on my contact list being contacted by computer companies I have dealt with.
My data? Good question. It's theoretically possible that someone has stolen my data. In which case I wonder what they did with it; I've never seen any effect of it. I still trust the major computer companies enough to use their infrastructure; I even use cloud services offered by the major players for managing and storing my personal data, I trust them enough.
Now, Facebook is a different story. I know full well that everything I post on Facebook is being used by them. That's a problem, but unfortunately Facebook is useful enough that I have to do things there.
On the other hand, I've had my credit card number stolen frequently (it happens roughly once every year or two). In the few cases where I was able to track back (roughly) where it happened, the fault never lied with Microsoft, Apple, Google, Amazon, IBM, HP, or any company like that. Not even with Visa, Mastercard, or AmericanExpress. But with little gas stations, restaurants and stores whose gas pumps have been modified to steal credit card numbers.
I've been attacked by hackers (in the early 2000s, a Linux machine at my house was rootkitted; fortunately, the attempt failed, because the script kiddies had bugs in their scripts).
I trust Microsoft and Apple (and all such companies, with the exception of Uber and Facebook) much more than I trust the corner hardware store, or the local gas station, and that's based on decades of experience.