Let's see, there may be someone here to argue with this point;
If I could do only ONE version, I'd pick trap bar no question.
Reason: I've topped out @ 580x1 on DL and I've topped out @ 640x1 on trap bar. The way I see it, 640 does a bunch more for my traps, forearms and most likely everything else that 580 ever could.
It's the same ROM but 60 lbs heavier.
If one did rack lockouts at 700lbs, due to the shorter ROM it would NOT be the same even though the weight was much heavier.
I just confused myself!