The feature that drew me to the iPad is the seamless synchronization among Apple devices. E.g., photos taken on the iPhone automatically appear in the Photos app on the iPad (and the iMac, but I hardly ever use the iMac) because they automatically go to iCloud where they are stored. I don't need to do anything (such as put the photos into Dropbox) to make this happen.
Similar synchronization occurs with email and documents created in Pages (like MSWord) and Numbers (like Excel).
This automatic synchronization is SO good. Does the system you are considering collaborate like that with your cell phone, especially for photos taken on the phone?