Current Colts are very nice: good SA triggers and in the King Cobra .22 Target I have, Colt finally figured out how to make a good/excellent DA trigger. Older Colts just not so. And getting one worked on or finding parts for one is realistically impossible.
Smith's...you can take their SA triggers and probably 90% of their DA triggers and do good work right out of the box. Parts...there are plenty. Gunsmith help...lots of it. Accuracy...of the two dozen + that I've owned, only one would not hold sub 2" groups at 25 yds from a rest with good loads. (guessing now as it's been 55 years since I bought my first one) The one lemon was a 4" M-25 when they first came out: throats were 0.458" and the groove dia. was 0.452"...I could toss walnuts in tighter groups than that revolver would shoot. A trip to Springfield's factory service desk (I had a friend there at the time), revealed that the oversized throats were to factory design. Several years (decades?) later Smith finally figured it out around the dash 6 or 7 revision, IIRC.
So, for the OP's mandated choice: an original Smith vs Colt...I'd go with S&W's 686, but with the caveat that it's going to be HEAVY on the waist belt, padnuh.... Best regards, Rod