Larry: I can't speak for most WWers, but I know what I have done.
I have a sled with adjustable fences that I use on the Table saw. I use this to cut something like picture frames where the width of the stock is laid flat and the 45 is measured relative to the edges of the width. Cut one piece on left, other piece on right side, and as long as the fences are 90 perpendicular to each other, the joints work well. I am too cheap to buy a high quality gauge.
The other case is where the 45 degree cut is made relative to the flat or wide faces of the stock; think a jewelry box with mitered sides. Here I have cut using a miter saw because depth of cut was an issue (miters for a box that is ~3-4" tall); I could not use my TS sled, stand these pieces on their edge and use my TS sled. Using the TS with the tilted blade would have been the answer, but I would not expect the tilted blade of my contractors TS to produce great cuts here. Maybe I am just too lazy to try to bring my TS all into alignment; Contractors saws often have alignment issues with these tilted blade cuts, mostly due to the design of the motor mounts and the torque produced when the assembly is tilted - or so I read because I have not actually tried it.
So my answer - it depends. I have used both.
Henry W