Of the two, I've always preferred one of the Pachmayr models. BTW, unlike what one poster wrote about Pachs being for people with bigger hands, the fact is they have a number of designs; open backstrap, covered backstrap, compact, target-type, etc. You should be able to find one that works for you.
Now, if you wanted my honest answer to this question, for you K-frame it would be "none of the above." I'd put a set of Ahrends on it. My personal preference in the Ahrends line is usually their Retro Combats. They are long enough for a good grip and control, yet compact enough to aid in concealment.