I can't rule out any S&W revolver, it would be fairer for me to say that S&W makes my favorite revolver and leave it at that.
However, I've sort of thought long about what my favorite is, and I looked at it like this; what if I could have only one? I'm actually practically in that predicament; I live in Germany and can only own two handguns as a hunter...period. You can guess who makes the two that I own.
I own several weapons in the US, of course, but can have only two here in sunny Deutschland. Last year, I found my "grail" revolver (I actually hate that term), a 547. I have always liked the K-Frame 4" HB Model 10 and it's spinoffs like 13s, as well as SS 64s, 65s and so on. I also have a 619, a kind of L-frame version of 4" HB M10 series. But my hands down favorite of all time, for several reasons, is the 547, and here's why:
1. Caliber/cartridge. You can hate or dispute the 9x19 all you want, it's a great compromise of size, power, weight and availability. With the 547, you can digest the infamous 147 gr. bullets, with no feeding issues (hey, it's a revolver). More punch than a .38, less kick than a .357. Plus, here in Europe, 9x19 is simply everywhere, made by everyone and cheap. Actually, 9x19 enjoys that advantage all over the world. And in +P, it's pretty potent, if you feel you need all that. Say all you want to about 9x19, I don't really care. It's all about shot placement anyway.
2. It still has that Model 10 appeal, balance and look, which is a great match to my shooting skills and preference. It's an easy transition from auto's, which I have had much more experience shooting up until a few years ago.
3. It carries well, better than my issue M9 ever hoped to, as well as my current P228.
4. It's unique, in that you don't need moon's, but can still use speedloaders (if you can find them). The extraction system is really interesting, but it's no niche gun, it's a serious shooter. It's insanely accurate, and instills confidence in my shooting abilities, in any condition.
5. In Germany, one can only ever carry a handgun when hunting. Autos and tactical stuff are really looked down on by the old timers I hunt with, so this 547 is actually well received by those old guys. They flip when they find out it's a 9x19.
6. It's a revolver in an auto cartridge, which for me, makes it twice as useful, best of both worlds if you will. I think S&W outdid themselves when they made the 547, just too bad they won't bring it back (like a stainless version?). And no, it's not the most expensive S&W and all that other mythology, the cylinder is actually amazingly simple.
7.
So, that's just MY favorite, and why and I'm definately not saying it's better than anyone else's, just for the record.