I don't want to get into which barrel length is more accurate, but I can comment on this...
If you are going to settle on a particular length, then stick with it and don't do like I do. I show up with RVs in 4 5/8s one match and then 5 1/2 the next. Then I get tired of cartridge and show up with C&B and shoot 5 1/2s and then 7 1/2. What I am getting at is that if you want to be able to shoot well and have all the mechanics of drawing and holstering and sighting, then stick with one length barrel.
OK, I hear you asking, why do you you do that HD. Answer is to throw off the competition. Naw.... it is because I go to CAS matches to play and am not a competitor. That is the answer. I look into the safe and grap a pair that catches my eye and away we go. I like getting out of doors and having some fun. The CAS rules allow for me to have fun and that is what I do. When it isn't fun, I'll disappear.
So, I guess I am no help with the question at all, except I seem to favor the 5 1/2s