There was a single year where my primary machine was a Mac because I had to do some iOS work. Since I did't want the hassle of dealing with multiple machines every day, I went with a MacBook. As soon as I realized this was exactly what Apple wanted (to force developers to user their machines if they have to develop for their platform, even if they primarily develop for other platforms), I started my migration away from iOS development forever. In that year, I also learned the hard way that it's a terrible idea to have a business model that relies on an iOS presence as Apple will reject your app and/or it's mission critical updates without a care in the world.