DartZeel CTH-8550 vs PS Audio BHK 300 Mononlocks


I know this is a crazy comparison but I am currently trying to decide between the Dart 8550 Integrated (used) or a new set of BHK 300 Amos with the BHK Pre (new). I am currently upgrading from a Yamaha A-S3000 and like convenience of the integrated but feel like the BHK monos might be a bigger upgrade. They will be fed by a VPI HW-40 turntable and a PS Audio DirectStream and will be running a pair of Joseph Audio Perspectives. 
jeremyfxdwg
i'm a darTZeel guy for 16 years. it always sounds special and the designs are minimalist and get out of the way of the musical nuance. the longer you listen to it the more you appreciate it.

notice that darTZeel is an 'end-game' place for many. i've spent time with the CTH-8550 and it's an excellent pre and amplifier.
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I am curious to hear which of the several above proponents of Dart over PSA have heard both in the same system.  What differences would you note?  TIA