I own and really enjoy both games.
At this point, I prefer the depth & code of BM66 and find it can be strategically played a few different ways.
DP has to be set up near perfect IMO to have the Katana ramp flow seamlessly. I love the left orbit to lifting ramp- very smooth; and the rules have come a long ways from initial launch.
For theme, as always, it comes down to personal choice. I dig both and think they’re each enjoyable in their own right.
I would play both and start with the one which immediately resonates with you.