I take your point Pitindall though on a daytime mooch, usually the first thing spotted is the moocher, unless your dressed like Cammoman in some realtree gimp suit and in heavy cover, us uprights are usualy stood where we ain't best placed to blend in and stand out like sore thumbs!
As for the dog, of any colour, that puts up game, it's gonna run it, where and how far you just don't know and on the move in open countryside or in winter cover they will get notice too.
I would have no problem choosing a white pup in a litter for any type of work, personal choice but I like white dogs,