The differences between the Imaging Programs?
Basically, features. But theres also other things such as how well the compress the Image.
For example, Lets say all your DATA is on 1 single Hard drive, and you have your images on a external, or even a secondary Internal.
If you were to accidently delete something, (lets say the entire My Pictures folder) you may be required to completely restore the entire Image to get them back.
I think this is how Win7s will behave. (Please correct me if wrong)
Others, that offer more features and are more flexible will allow you to browse the contents of the Image, and restore selective files or folders. In this case the entire Pictures folder, or just a Image.
Im not that familiar with macrium so Im unsure if it allows this.
Some are only capable of Imaging partitions, others can do, not only partitions, but the entire disc (including the reserved 100MB partition) and restore it all in 1 go including the disk signature.
Additionally, some may offer other features such as Incremental, Differential backups, Automatic Scheduling.
Also, you will not be limited to just creating Images of a drive, but can also set schedules for Backups of target areas. Perhaps just the documents folder or Videos etc.