Very Narrow baffles will image second best.
Very wide baffles (like mine) will image third best.
Speakers flush mounted into a wall with essentially an infinite baffle image the very best.
Intermediate size baffles tend to be the worst (about 1 foot to 2 foot).
Wilson triangular angler Watt puppy design is a very good example of a small effective unobtrusive baffle.
summary
Excellent < 1 foot (think small two way and audio physic narrow designs)
1 foot < mediocre < 2 feet
very good > 3 feet
perfect > 10 feet
but remember the shape of baffle edges can be just as critical.