The only 'integrated' thing about OneDrive is that it's pre installed on Windows. Other than that its just 'another' app just like DropBox would be. In a Preview build of 10 they embedded it properly so by default all your Documents, Pictures etc were in OneDrive. But they scrapped that.
So, the fact its not really integrated aside, its really just a choice of what else you will use. I have Office 365 which comes with 1TB of OneDrive so I use that for my personal stuff. I have manually redirected almost all the folders in my C:\Users\username folder to OneDrive folders on my PC, Laptop and GFs laptop so everything is just automatically synced using the default save locations.
However, on my work laptop I've had all sorts of issues with OneDrive for Business, so scrapped it and use DropBox instead (we have an Enterprise subscription). The result is identical however. I have setup a personal folder on DropBox and then redirected all my C:\Users\username folders to use that. Exactly the same setup, same default save location being synced, just a different providers.