Bonus to TP only impacts accuracy not damage. Been gone to long to think about delays. lol
Since I only tend to pull out the gun on RNG for zergs i decided to go with 10% WS damage. Since the delay improves my ability to get to a lower hit build and my slug RACC is pretty good on RNG, I couldn't see the advantage in the end.
On COR it was a harder decision since slug RACC is still an issue. But in the end, for 90% of what I'll use the gun for, 10% WS dmg and 2 higher base damage would be better.