Windows PC's for me and my family, and various versions of Windows. I wouldn't ever get an apple computer unless I won one for free- too overpriced, too difficult to upgrade for a reasonable price, and just... apple. I personally dislike the company. I don't need anything fancy or popular at all, I just want whats works, and works well; apple's ridiculous price point with the exact same or better service I can get via a custom built computer for less then half the price just doesn't work well for us.
My husband's messed around with Linux before, but in general we prefer Windows since essentially all games will run it. He's running 10, and I'm still on seven until we can get it upgraded. I think I'm leaving my Surface Pro 2 on 8.1 because it works fine as it is and I don't want to hassle with my art programs deciding they don't like windows 10 or something. I figure around the 8.1 starts becoming unsupported, I'll likely want to upgrade the hardware anyway to a new tablet of some sort for art.