I agree as does a lot of period literature.
A 6-pdr battery could get more balls on the target with the same degree of accuracy as a 12-pdr battery. A battery of 6x 12-pdr fired 270 rounds in 30minutes, a 6-pdr battery 360 rounds. At 500m, the 12-pdr battery achieved an accuracy of 40% (107 balls on target) and the 6-pdrs 27.5% accuracy (135 balls on target). These tests were carried out to evaluate the value of the 6-pdr compared to the 12-pdr and other calibre guns then in use in the French Army.
Lespinasse, Scharnhorst, Muller, Decker, Monhaupt all give the same answer than 12-pdrs were useful in demolishing bridges, field fortifcations and had a slightly longer effective range (but on a battle field this was theoretical given the amount of smoke around).
This is presented in DDS Napoleonic Artillery pp234-238