Just thought i'd get some thoughts on this. if I have the opportunity to find a used one theyre usually a fixed cutting edge. I'll mostly be doing medium duty repairs to driveway and access to woods for firewood....
I prefer the fixed back blade, not the hinged. That way, I can tilt the bb up enough in front to ride on the rear blade for "only hitting the high spots".
Yep Larry, mine's like yours. If I'm doing rough work I like it hinged. Allows the front cutter to take a bigger bite. If I'm doing delicate finish work like leveling gravel I like the rear blade bolted solid, lots better control. Also as Ken states, having the ability to tilt the BB with a hydraulic top link makes a world of difference as well.
Larry and I are grossly spoiled, our BBs also have hydraulic operated scarifiers. With Top n Tilt added you can do almost anything with it without getting off the tractor.
I prefer a rollover blade to either of the standard boxes and I have used all three over the years. You can flip it backwards for dragging out the high spots on the drive and the increased weight helps as well. Plus, you can use the scarifiers independently of the scraper which allows digger digging and smoothing without the hassle of removing them. More money, but over time it is insignificant.