The quote was from an IDPA email you get as a member. If you don't agree, take umbrage with them, not me.
The quote, if it is a true quote, likely came from the "Tactical Brief", a publication sent out to IDPA members. The "Tactical Brief" is a collection of articles written by various authors on subjects that relate to personal defense and concealed carry, not by IDPA. For those of us who shoot IDPA and are involved with the sport have a pretty good idea how popular revolvers both in the sport and on the street. You would not be quoting a 3rd party to support your love of revolvers if you had any personal reference to refer to. Let's leave it at that.
You obviously like revolvers and apparently are quite good with them. Shooting 2" revolvers well at distances past 25 yards quickly and accurately is no mean accomplishment. I know it can be done, but it does take practice and talent. Some have the talent, few have the time to spend practicing well enough to get good enough to make the claim. They are fun to shoot and as a result there are several sports ICORE, and PPC to name two along with, and to a lessor extent, IDPA and IPSC that support revolvers. Some have better draws of participants than others.
To the OP if you have any intention of playing IDPA with your revolver get the 4.2" S&W 686 or the Ruger GP-100 with a 4.2" barrel. These are the only two major players that are available for Canadians. The barrel restriction for both categories in Revolver Division is 4.25". We instituted a 6" exemption for revolver play in Canada when there were no gun manufacturers making revolvers with barrel lengths over 105MM but less than 4.2". At the time of the exemption being placed the barrel limitation was 4.2". This exemption was done to encourage the use of revolvers and to allow the majority of our members who did not have 12.6 status an opportunity to play with their longer barreled guns. To my knowledge I know of two individuals in Canada who took advantage of this exemption and one of those still does at club marches.
I don't shoot IPSC anymore but have talked to those that do locally and with IPSC rule changes eight shot revolvers are now allowed in their revolver division. Those two locals who have shot revolvers division with their 6 shot 625's & 685 (one former National Champion and another Provincial Champion in two sports) consider the six shot guns to now be obsolete. I only shot one IPSC match with a six shot revolver and
found it a tedious exercise. I think it is fair to say pistols dominate that sport for a reason as they do IDPA.
As for a range toy both the 6 inch and 4.2" will do just fine. Neither will be more or less accurate than your ability will allow so I would not worry about that. I think it would be fair to say the shorter gun will be better balanced n the hand and lighter for most. Unless you reload, shooting the gun often will be relatively expensive and you will find you won't be shooting it near as much as you like. You may at some point decide to sell it and here is where the choice may become more obvious. The 4.2" inch gun will sell much faster than the 6" gun because there always seems to be someone looking for a deal on a revolver to shoot and the shorter barreled guns seem to sell faster than the longer barreled guns....at least is seems so if you follow the EE here.
Hope you get one soon and come out to play. Loads of fun. You don't have to be good to enjoy shooting handguns, just be safe, handguns will give you challenges and a hill to climb.
Take Care
Bob
ps If you choose Ruger I would have the cylinders checked. Rugers are famous for having to tight of cylinders. My GP-100 came with three cylinders that you could not pass a .356 slug through and three a .357. If you shoot lead bullets at all you will want them all to be .358. Have the forcing cone cut to 11 degrees from the factory 5 as well. Add hammer and trigger shims and reduced power main and trigger return springs and you will have a very sweet smooth trigger that is the equal to any tuned S&W revolver. Rugers are great revolvers but tend to often be kit guns requiring a bit of TLC.
rb