Choke tubes are like A--holes, everybody has one, but some are better than others.  You can not go on the assumption that just because my buddy has one it is what I want.  To see the real difference you have to pattern your gun with the choke.  Using the same shell each time, shot your gun at 25,35,45,55 & 65 yards on a very large sheet of paper with a crow drawn on it.  Then count the pellets or hits, then check the density of the pattern of each shot.  Do this with your Pattern Master, your Carlson, your Browning, etc. and then a Muller.  Compare the different chokes and see for yourself.  My point is, there is a difference and most of us have to prove it to ourselves.  New technology keeps changing our sport of hunting for the most part to our advantage.  Keep up with it!

Just for a reference:  My choice of chokes are Imp. Cyl. or Light Mod.