For a trail gun a bit smaller than an L-frame, with adjustable sights, I'd find myself a good used Security Six. Yes, the SP101 is a bit smaller, but for a trail gun this will hardly matter, and the Security Six will give you one more round in the cylinder. Also, for a trail gun, I'd prefer to keep the hammer spur. The main reason -- the spur makes it easier to find a field holster that will secure the gun, as most seem to have retention straps that loop over the spur.
Now, if my main use for the gun was going to be concealed carry, I might still go with the SS -- it's a darned nice gun. But the slightly smaller size of the SP101 makes things just a bit more convenient. And, I'd bob the hammer, too. Plenty of good, strapless concealed carry holsters out there, and SA fire with a bobbed hammer is quite easy and safe once you learn how to start the hammer back slightly with the trigger, hook your thumb over the top and front of the hammer, and haul it on back. But DA fire is the best discipline to cultivate for defensive shooting -- much faster and more positive than SA, and darned near as accurate at any range once you learn how to do it.