They aren't really comparable, even though it seems like they would be.
The badlander is much more thin, sharp, marshally, and detailed in the midrange. It's its own thing.
The RI from what everyone says is like the perfect recto, like a rev C or whatever the fairy dust revisions are. It's got a huge low end, with all the benefits and drawbacks that entails.
Get the RI if you want the rectifier tone, get the badlander if you want a more aggressive, slightly darker version of a modded marshall. They both sound good but they sound so different you shouldn't really be shopping for both of these at the same time trying to compare them.