I use to go to extremes to get N frames in 83/8" models. I don't know why, probably same reason I always bought full choke shotguns with long barrels. Then one day got 6" M27 on a trade and found I could shoot it as well as a 83/8".
So now I go for 6"-6.5" models. I wouldn't pass on a 5" either. So for practical shooting which to me is hunting a 6" is the practical length for me. It would also double target shooting.
I have found that barrel length is not the only consideration. The 27 and 24 have tapered barrels which make them better balanced for some shooters. Like the M41 I can shoot the 7" & 73/8" barrels better than a 5.5" heavy barrel. I my case it is balance because rested there is no difference. Jury is still out on 5" field barrels, haven't got enough trigger time to draw opinion.
For me the Patridge blade front is only way to go. They give clear sight definition. I don't like Baughman Ramp because top is always polished from holster. Worse is the red ramp.
There is no doubt a 3.5" m27 with a red ramp is very stylish for looks but I've always been behind on style.