This may be more of an age or software difference, but I recently had a '16 plate 184 loaner while my 13' plate 150 was in for some work. Both equal spec otherwise and both DSG. The gearing on the 184 is quite different; in equal driving scenarios and speeds, the 184 sits at a higher engine speed, whereas my 150 can't wait to get to 6th gear!
I've had both 184 + 150 (diesels) the 184 does have more pull. its not massive to tell the difference at first but when you put your foot down in 6th - the 184 pulls - the 150 has to go down to 5th to have the same affect. it's little things like this that make the difference - 184 is a nicer drive (in my opinion)