Welcome to the forum "rookie!" You will find this forum is frequented by lots of very well-informed folks who take pleasure in answering your questions . . . for we have the passion for the firearms and love to see new people develop that same passion that we have!
The 27-2 is one of the "grail guns" of the S&W revolvers that most people dream of owning one day. Polished with a mirror-smooth surfaces, they were gorgeous in both the rich blued finish and/or the mirror nickle finish too! Checkering on the top strap areas made 'em the premium production line too.
Different lengths have been offered, and are preferred by different people to be used for specific types of shooting and uses., different widths of triggers were offered for different types of shooting disciplines/sports/defense, and shapes of grips offered too that would also be wanted for specific types of shooters/sportsmen. Alas, you probably already know this stuff. If not, you'll learn a lot here if you are hungry.
Mine pictured below is from the very early '70s, according to serial number, and it has the gorgeous proportions with the shortest, 3 1/2" barrel length. type, and included the narrower-faced but grooved trigger for smooth and fast double action shooting, and the sleeker/slimmed "Magna" stocks for fast draws and less bulk.
This version was quickest from the holster, and the thin and more rounded trigger was perfect for double action, long stroke fast shooting for self-defense.
The other barrel length versions came with the bigger/thicker "Target" type stocks and a wide but flat-faced "Target" trigger designed for more hand-cocked accuracy purposes. Great for all-around purposes including hunting and target competitions.
Later in the '70s even many 3 1/2" versions also included the wide triggers and bigger target stocks, thus narrowing my search to a 3 1/2" version to a little older Model 27-2.
So which type might interest you in your first 27-2? All are equally accurate, but different tools have different strengths!
PS: Mine arrived so danged perfect that it became an instant safe queen. I kind of wish it had had a scratch or too! LOL