I know a little about it... for what its worth ,
A classic straight wrist or even the drawn out Prince of Wales style offer a better transition between the front and rear trigger of a double trigger gun ,but these styles like any other are something that has to fit the user or be fitted to him/her to realize its full potential.
An off the shelf shotgun is anticipated to fit the everyday Joe and they do that quite well in most cases ,we just pick up a certain shotgun and they feel fantastic ...but do it shoot like that ? not necessarily
I experimented for quite some time to find my perfect fit (helps that I do this for a living ) but my physical measurements and what I shoot well are two different things ,setting out for a day with measurements ,a try-stock ,shells and a pattern plate will tell the tale , other than it is luck of the draw .
A closed pistol grip is going to bunch up a larger hand ,but if its what a certain individual like's then it can be made to fit ,but to make the quick transition between front and rear triggers there has to be room for the hand to move /shift and nothing can be less obtrusive than the straight hand stock ,it is after all designed that way - for that purpose .
Hope that helped ,
Chris