I'm unfamiliar with your B&K, but I have compared my xt32 equipped Onkyo prepro to my old Theta prepro and IMHO there are two answers to your question, depending on your set-up.
1). If you use subwoofers, the odds are good that the xt32 (or equivalent like ARC) unit will sound MUCH better. It's always possible that in any given room you may be able to get the smooth FR in the bass and seamless integration of DRC software with careful placement and skillfull set-up, but I've never been able to get close. In my view, the DRC equipped modern unit probably wins in a runaway.
2). If you're not using subs, then it's a different story, and I'd hesitate to make a generalization.
Marty
1). If you use subwoofers, the odds are good that the xt32 (or equivalent like ARC) unit will sound MUCH better. It's always possible that in any given room you may be able to get the smooth FR in the bass and seamless integration of DRC software with careful placement and skillfull set-up, but I've never been able to get close. In my view, the DRC equipped modern unit probably wins in a runaway.
2). If you're not using subs, then it's a different story, and I'd hesitate to make a generalization.
Marty