I have more Smith's than anything, but I also own Ruger's and Colt's. For daily carry and/or woods use, I'd probably stick with the 27. A 686 was the first centerfire revolver I ever bought, and one of my very favorite guns is a 586 L-comp. But comparing them to the Python is just not fair. Even my PC 586 is not as smooth as a Python.
The Smiths are GREAT guns, and by far my favorite, they don't make a bad one. But the Pythons are in another league. They are more comparable to the Performance Center guns than catalog items.
The telling statement I hear is "with an action job my "insert name here" is just as smooth as a Python." Yeah, but the Python comes that way to begin with. I had a guy that is basically a hunter as opposed to a shooter tell me how good his GP-100 action was. I first handed him a bone-stock Model 19 and he was impressed, then I handed him a bone-stock Python, and he was amazed.
Yep, they are a little more delicate and don't appreciate slamming the cylinder shut, and rapid firing and howitzer loads will cause them to go out of time quicker than a Smith. And they are pricey.
But a Python is a little like a Ferrari. You don't have to run it wide open to appreciate the engineering and artistry.
To end my long-winded ramble, I'd love to find a nice Model 27 myself, the N-frame just feels great to me. And if I happened upon both and had the cash in hand for only one, I'd go with the Model 27.