I have a 686-1 Power Custom Combat with a Clark Moon Clip Conversion, as well as a rock stock 686-5. Both are 4". I holster carry all of my revolvers, except my Big Hunting Pistols.
I have 11 carry revolvers with barrels from 1-7/8" to 4".
I also have a 480 Ruger Super RedHawk 7-1/2" with open sights, and a second 9-1/2" one with an UltraDot 30mm that is my deer hunting gun.
I do not own any 6" guns at the moment. They are plain unhandy to pack around in a holster. I do not holster carry the Super RedHawks either, I carry then in Boyt Cases with shoulder straps added.
If you only shoot at the range, and do not carry in a holster the 6" may work for you. I belt carry 365 days a year to include driving a vehicle. Barrels over 4" do not work out for me. Today I was carrying my 3" Model 66.
You may wonder why I have a pair of 4" 686's? The Power Custom Combat is the wifes house gun, and has been for over 20 years. I picked up the second 686-5 so that I had my own 4" 686 again. If my Pistol Smith, Ron Power can get the new 686-5 to work like a Swiss Watch for me, I may replace my 4" HB Model 64 SSR gun with it sooner or later as my primary match pistol. I will be patient, Ron has the 64 running about as slick as a revolver gets now.
Bob