My bass went from Nordy DCs/OBP-3 => Nordy DCs/Pope => Aggie DCBs/OBP-3. I also have a Century 3006 with Roscoe Barts/Bart pre and ash body, maple board to compare to. The Century is about as classic a Roscoe sound as you can get.
I wasn't big on the the first iteration of my SKB. It sounded fine, maybe a close comparison to Bart CBs. But, there was some mud in the top end. I thought the pickups just needed to be opened up more so, I went with a Pope preamp which I figured was as transparent as I could get. I was wrong. I had to EQ the bejesus out of it to get a usable tone. The mids were almost uncontrollable.
I played one of Greg's basses with DCBs at the last GTG and fell in love. So, I ripped out the guts out of mine and put a brand new set it. Wow, they changed everything. I've found the best tone is flat, maybe a smidge of bass. The top end doesn't have the mud that it had before.
Compared to the Barts it's like Roscoe with even more Roscoe. The Aggies have all the good stuff the Barts have just more of it. And, I might even say they are a cleaner sounding if that makes any sense.
I'll post up a country tune I worked on in a little bit. I pretty much live on the B string the whole time but, you'll get the idea.