The Seb has a hard flat built-in rubber bottom that is very non-skid and seems to hold the bags shape especially well. The quality is top-shelf and it's a great bag plus Seb sews in a piece of neoprene under the stitches and the rifle rides up on a nice flat and if you like to shoot with the bottom of the rifle bottomed out on the bag (not up on the ears) it is a big plus as i never though having the butt dragging accross the stitching was ideal.. Also I think they ran about half the price of an Edgewood when I got mine last year.
Edgewood bags are also great quality and available in a much wider range of heigths and sizes and ear spacing which is needed for some rifle stocks.
It really is a matter of your shooting discipline, shooting style and the shape of your stock......