I used to believe that I really needed adjustable sights... but I've found over the years, for what I enjoy actually doing with the revolvers, that it's just not all that important. However, I do much prefer the actual view/sight picture that I get from the original S&W adjustable sights than I get from the fixed ones.
So I would choose the 67 if everything else were equal.
There's almost -ZERO- chance that "everything else is equal." So if both were sitting in front of me with similar prices, I'd be looking & feeling for the double action smoothness and especially the natural timing and cylinder advance.
To me, the timing means... probably... far more than it "should" or "needs" to actually mean. It's just a 'me' thing. I want to see that cylinder advance and lock up as evenly and consistently on each of the six double action pulls. If you very closely inspect your S&W revolvers, you'll find that it's not as "perfect" as you may have thought or hoped if you haven't really studied it.
To reiterate, it likely does NOT need to be as "perfect" as I like it. It's just a hang-up I have. I don't kick them to the curb if they aren't perfect, but if I'm comparing two of them, that's a major thing that I'm looking at.