Thanks, wasn't aware of this one, have been using clonezilla for years and never thought to investigate something newer.
Discussion
It's a matter of preference and knowledge. Rescuezilla has a more modern GUI that is easier to understand for people who aren't used to something like Clonezilla. Clonezilla is just fine though.
Well, except for some of the confusing options that aren't as clear to less experienced users. That's where Rescuezilla is better in my opinion.