The Abba is right at $700, while the Bursig is $609 (once you add in the cost of the 'bike specific' adapter plate). It looks like the plates run about $120 each.
The Abba seems like the better deal to me, since it allows more lifting configurations. Also, you can get the Pro Sky Lift package that comes with the Technician's kit and you'll be good for probably all the bikes you'd ever want to work on. Add the $35 swing arm removal kit and I would think you'd be set up for just about any job you'd need to do.
Of course that's based on Revzilla and Abba USA pricing. It sounds like y'all have found the Bursig on Ebay cheaper. If there's only one bike in your garage, I guess the Bursig could be the better deal - just based on price. But for a guy like me that currently has three motorcycles in his garage, the Abba is looking like the way I might go. I'm not crazy about that little strap thingy, but it seems like the system works.
Thanks for posting these! I had no idea this kind of thing was out there ... and now it looks like I need to do some overtime so I can get one!