Nexus and Surface Pro users - Which ecosystem do you choose?

If you own a Nexus device and a Surface Pro machine - which ecosystem do you predominantly choose? Google Drive or SkyDrive, Google Keep or OneNote, Google Search or Bing, Google Music or Xbox Music, Gmail or, etc.

Both platforms are supported by either ecosystem, the compromise maybe less integration with non native components and other features. Nevertheless, we have to choose - so what is your pick? Do you start from the phone, computer, or service and work your way through?