I try avoid installing apps unless it's something I really want and the app is far better than the web site. Apps these days are loaded with spyware. I assume that any mobile app will track me as much as it can possibly get away with. It's almost like voluntarily installing malware.

Web sites track too of course, but their capacity to do so is more limited. I fully revoke location, camera, and microphone from the browser, so all it can do is track me on the web and get a very rough idea of location via GeoIP. Desktop apps can also track, but mobile offers a lot more intimate information (especially location) and is constantly connected.