The pre IL/MIM 617 is more collectable,
If you are going to be shooting it alot advantage goes to the 10 shot cylinder , if you fire 600 rds of .22lr the 6 shot would be opened, ejected and loaded 100 times, the 10 shot only 60, that's alot less wear n tear on the cylinder/ yoke plus more trigger time less loading unloading time.
If you want a trainer for your Model 14 or 19 the 6 shot spins up exactly the same, the 10 shot has a much quicker / shorter cylinder spin so it feels very different in double action. Single action trigger feel is the same because you aren't advancing the cylinder with the trigger if that makes sense.