Howdy from South Carolina, and welcome to the forum.
You scored some points here, for appreciating the mechanical artwork that is the revolver, as compared to the "tupperware" that is the modern plastic semi-auto.
As many opinions as members. If I had to choose 1 revolver for everything, it would be the 3" barrel 686 Plus (seven shot).
It's a great utility caliber that provides a very wide range of options, from low-power target rounds to high-power hunting rounds. The ammo is readily available and if you shop carefully, relatively inexpensive.
The 3" is the longest barrel that sports a round grip for concealment, and the shortest barrel with a full length extractor rod (for positive spent shell removal). It is long enough for good accuracy, and heavy enough to absorb the recoil pulse of stronger ammo for comfortable range shooting sessions.
The 3" also seems to have a great balance, to point very naturally. However, if you never intend to conceal carry it, then a four inch or longer barrel is unnaturally accurate with a bit more ability to absorb recoil.