> Which mobile platform provides unlimited/better for no cost?

For one, Android. I use Syncthing; my phone reports that I've synced 27gb of local state to my PC and laptop without me paying a dime.

Caveat being, you have to use a mobile platform that doesn't prevent third-parties from integrating with the OS. iCloud's quality is almost besides the point when Apple uses their software control to ensure a feature-complete alternative can't exist.