Im about to update my 9mm ammo stash and I was looking at these 2 rounds for carry/self-defense purposes. Ive seen the gel tests and both seem to be good performers however each bullet type has different advantages. The gold dots seem to be much cheaper(around 50 cents a round) vs the DPX load which is almost $1.50 a round. The DPX bullet is lead free which is a plus but supposedly is not as effective through auto glass.
In my experience the Gold Dot works better through glass, the DPX better through metal.
I prefer the 124gr +P to the 147gr Gold Dot for the more positive functioning it gives in marginal circumstances, such as poor grip, gun dirty or not lubed well, etc.
The 147gr loading has a bit less snap to it, recoil wise.