So my wife and I are at the stage where we currently both have Android phones and use a Surface Pro 3 docked to a screen for our PC. 
We are in the Android ecosystem with all our photos on Drive and use Google Doc's, Sheets for documents and sharing with each other. Even though we have the Surface Pro 3 are not really using Microsoft products in any way. Just use Chrome on it etc. 

We both need new phone now and wondering if we might switch to getting 2 iPhones and a Mini Mac as our PC. I also have an iPad air I use currently. But have a few questions before moving. 

1   Do Apple charge you storage for photos and video you upload to the cloud. And can I transfer ones from Google Drive        to Apple easy. Just Apple storage is more expensive. 
2   Is it easy to share documents on Apple with pages etc so we see each others files and edit them via iCloud. Also how          do Apple apps compare to Google Docs and Sheets. 

The main reason for change is my wife finds Android a little complicated and not a fan of current phones. Also I play a few games and find iPad much better than Android devices.