Really hard to choose, My first was a 14-2 I bought myself as a graduation present for pharmacy school back in 1968. I then shot a combat masterpiece as handgun qualification in USAF OCS abut a year later, I liked the balance of it a lot. Then in late 69 I picked up a 17-2, and honestly for shooters that was it for a long time. I did get a couple of stainless, fixed rear sight .357mag models, one a 3" the other a 4", one was for my son going off to law school in another state. When my father died I ended up with his 4" model 10, and then I got a M29 and a 629 Classic Hunter, unfluted cylinder and factory ported barrel. A few years back I got a plain hand ejector in 32-20 as a companion gun for a little Marlin 1894CL in that caliber, Then a couple of weeks ago I was in a shop and spotted what looked like a combat masterpiece, but it was a .22LR, turned out to be a model 18 so I made a deal on it, and ordered and finally received a model 48, .22wmr.
I would say my two K models but have yet to shoot the M 18 and think it might take top billing if it shoots good.
I almost forgot I did get a 342, one of the Ti Lite models, double action only for pocket carry, but it is just a little too large to conceal unless you have big deep pockets. Plus it is so light at I think under 11 oz that it plain hurts to shoot even with standard 38 special loads, so it is at the bottom of the list for favorites.