> . I omit Google as I do not really have any experience with their OS. Are they doing less nagging for their services?

If you buy a (Nexus) Android device, the device comes preloaded with all the Google services and apps, but you are only nagged about two things:

1. log in with a Google Account (for Play Store, Gmail, Calendar and all the others), and 2. Opting in to Google Location services.

That's about it. What get's annoying though is if you for whatever reason ever need to factory reset your phone, you will have to go through various splash-screens and introduction pages in all the apps (Maps, Youtube, Photos, etc) again.

I'd say the nagging factor on Android (at least for the paid apps I use) are as close to zero you can get.

Compared to for instance Windows, it feels much better.