A phone with Google Play Services collects less data than an iPhone.
To wit: Apple knows every app you ever downloaded, and there is nothing you can do about it. Every time you click on an address link, it sends the address to Apple, and there is nothing you can do about it. Any time an app looks up your GPS location, that location is sent to Apple, and there is nothing you can do about it. If you want to write apps for your own device, you need to give card details to Apple, and there is nothing you can do about it. A phone with Google Play services doesn't suffer from any of these problems.
If you disable Location Services, which is an option presented on initial setup of the device, apps can still request the GPS permission directly (the default behavior in most location libraries), not sending your location to Google. This is not possible on iOS. Every location lookup will send your location to Apple.
"By enabling Location Services for your devices, you agree and consent to the transmission, collection, maintenance, processing, and use of your location data and location search queries by Apple and its partners and licensees to provide and improve location-based and road traffic-based products and services."
It will also send your location to Apple when no app is requesting your location:
"If Location Services is on, your iPhone will periodically send the geo-tagged locations of nearby Wi-Fi hotspots and cell towers in an anonymous and encrypted form to Apple, to be used for augmenting this crowd-sourced database of Wi-Fi hotspot and cell tower locations."
Unlike on Android, you cannot get your location without sending this data to Apple:
"To use features such as these, you must enable Location Services on your iPhone"
To wit: Apple knows every app you ever downloaded, and there is nothing you can do about it. Every time you click on an address link, it sends the address to Apple, and there is nothing you can do about it. Any time an app looks up your GPS location, that location is sent to Apple, and there is nothing you can do about it. If you want to write apps for your own device, you need to give card details to Apple, and there is nothing you can do about it. A phone with Google Play services doesn't suffer from any of these problems.