This has been a topic of much discussion lately...here is my take on it.
If you want an average sized snubbie..the 60, sp101 and 605 are my fav's. The 60 and 605 are slightly smaller than the sp101 and would make better pocket gun..although some carry the sp in a pocket...doesnt work for me. All of these guns can be had with a hammer and tda trigger.
The "pocket" style guns or hammerless/concealed hammer are the 640 and 650, both are nearly identical in mechanics and operation. The Taurus is alot cheaper and just as nice. Of course these are DAO. The Taurus comes with a smaller grip making it more concealable, much like the 342 38spec S&W.
These guns are stainless or carbon steel and are 357 magnuns, I think the combo is the best. Light enough to carry yet heavy enough to absorb some recoil of the magnum loads.
You can touch on the 649, "hump back" S&W...another good choice, I just think they are FUGLY! They offer the best of both worlds...pocket firing capable and s/a trigger if you like.
If you are into 38's the world gets much broader...small, light and tough. In an ankle or pocket gun this may be the way to go.
They are lighter than comparable 357s and handle recoil of the +P rounds fairly well...but can still kick like a mule. Its just a compromise or trade off. Lighter and smaller gun, more easily carried and concealable but shoots a less potent round. Many people think this is "the carry gun" ....I just like my 357 better.
Sorry for the rant....Ruger hammerless is just a bobbed hammer sp101...larger and not a true concealed hammr...but a cadillac in the snubby world. S&W 640 is another good choice..larger grip and true concealed hammer...great choice for larger pockets or IWB carry. Change the grip and you have a winner. Taurus 650 CIA...here we go. Priced right and bullet proof in design and function. Perfect for mid weight loads and has the grip for pocket carry....Stainless is nice and my first choice.....CIA..carry it anywhere....Its calling to me...." carry me everywhere"
Shoot well