Here is my quick head to head against a Tern (Similar weights 169-171 both star-ish material, both 9/10 or 10/10). I typically throw max 350-375 golf distance (RHBH).
Raw Golf Distance Winner: Tern
Top drives for the Tern capped at around 410 feet for me. The best I could do with the DDX was 377 feet. The Tern was easier to turn over at greater heights, which led to an increased distance.
Golf/Distance Consistency Winner: DDX
Raw distance isn't everything. The Tern needs a lot more room to work. Additionally, the Tern is more vulnerable to the wind. The Tern struggles with consistency with anything that isn't a tailwind or dead still. The DDX, on the other hand, didn't really seem to care about the wind. A consistent 360-375 foot shot was easily accomplished in various wind conditions/directions.
Forgiveness Winner: DDX
If I get the nose down on the Tern, it will typically cut edge and roll. The DDX, for my style of throwing, tended to skip forward and stop. On the one hand you are 40 feet off the fairway and short, on the other you are still short but in the fairway.
When I got the nose up, they are both pretty forgiving for me without any drastic dump fades to the left.
Best Feel in the Hand: Draw
They both feel very similar in my hand. The wing is almost identical.
Closing Thoughts:
Maybe I got lucky, but my DDX flies exactly how the numbers describe. Not quite as much glide as the Tern, but a more neutral, reliable flight pattern in a variety of conditions. I wanted a longer Valkyrie, and I think I found it. Will be looking to pick up some more when they become a standard run for sure. In the mean time, the Tern needs to be worried because it's spot is in danger!