My favourite and the one I own and shoot in target competition is a model 686-5 "International DX", SKU No. 104295. It's pre-lock, but features MIM parts. They are one of the few 686 revolver models that came frome the factory with a test target included.
In the shooting club I belong to newbies can use a club-owned S&W M686-6 (MIM and lock) with highly satisfactory results. Handles well, absorbs recoil, is durable and trouble-free - as are all L Frames! This one takes constant poundage by .357 Magnum rounds and keeps on ticking.
I know an outstanding handgun shooter who owns a model 686 since the late Eighties. His might be a -1 or -2 version. I don't know. What's more important is that his one was and is used heavily, with many thousands rounds of full power handloads shot through it. It holds up pretty good and is still as accuracte as it was when he first got it.
While I love the looks and history of the N frame model 28 Highway Patrolman (too bad there never was a stainless-steel version!), but as an "allround" .357 Magnum revolver the M586/686 reign supreme. While I also prefer the pre-MIM, pre-IL versions, they are all good, solid and accurate handguns. You cannot go wrong with any version you might encounter/find.