When accuracy testing my 308 VEPR (22"bbl) and 308 NDM 86 (~24"bbl), I got roughly 1 3/4" 5 shot groups. The VEPR was shot with handguard on rest, and the NDM using a Russian Drag, receiver mounted, bipod. Ammo was FGM 168g Match and Portuguese surplus FMJ. So accuracy wise I call them a draw.
In defense of the drag, shooting with the drag pod, didn't seem all that stable to me. It may have been capable of better.
The Tiger may have better accuracy since the receiver lacks the lightening cut of the earlier Drag, of which the NDM 86 is a copy. The Soviets may have realized the receiver might be stronger and more accurate without them, or just cost cutting.
Definitely don't drop 5,6,10K on a Drag in search of accuracy. Now if your after awesome coolness with no compare...