I have learned after 50 years that it is pointless to try and talk someone out of their choice of gun for a particular purpose. I typically find that when people ask about a particular gun, they are looking for all the reasons they should buy that gun, and none of the reasons why they should not.
So, I will not try to talk to you out of your decision to use a revolver for self-defense instead of sticking with your Glock 17.
That said, if you are stuck on the 686, I would try to find one of the "mountain revolvers" rather than the standard heavy barrel version.
Better yet is the factory new model 19 or 66, both of which have solved the problem of the 6 o'clock crack in the barrel shank, which is the reason the L frame 586 and 686, and the fixed sight versions, the 581 and 681, were invented in the first place. Unless you are going to shoot a continuous diet of magnums, which you can now do with the 19 or 66, I find the 686 too heavy. If you intend to use 38 special, I can see no reason why you should not just simply get the classic model 10 or 67.
Either way, you are handicapping yourself with a heavy double action trigger, 1/3 the amount of ammunition available without reload, and the slow reloading process, even with speed loaders, when compared to insertion of a spare magazine.
I do not mean to sound negative, but you did ask for opinions, so I hope you will take my remarks in the spirit in which they are intended.