there is no "best" 1073 clone... if you are wondering which sounds closest to the original, FWIW Greg Wells prefers ( from what i gathered in his postings ) the Brent Averill and the Chandler LTD-1, but he didn't explicitly say "these sound the most like the original"; he just said those were the ones he preferred.....
you will probably catch a bit of flack for asking this question...
i know you were looking at the Neve-AMS 1073 DPA or DPD... the one thing i can say about the DPD is that its converters are ( i think ) made by Prism so they should be quite good...
well we'll see what other people think, but of course the best 1073 clone is entirely a subjective thing so we will all disagree....
J.D.