Not really, well branched rape is always higher yielding. Thick crops produce plants that look like spring rape, and we all know how that yields.
Disagree, thick rape has 2 advantages, a crop from hedge to hedge, and no room for black grass. Where we have low plant populations with good branching it has yielded higher in the goodbits, but lacks a few meters around the headland and a few patches ( size of a car) is full of black grass.
So all in all no different overall as high plant pops gives more regular yield where as low gives more variability, and you only need one bad field to drag averages right down. Doesn't happen In trials as there's no headlands and if it's dodgy it's written off.