A lot of it depends on the size and shape of your hand.
You can also get a Model XX that has a better or worse than average trigger for that model.
Between us, my FiL and I have Smith K, L, and N frames in 38/357, as well as a GP100, a Blackhawk, and a couple of Taurii. They range in barrel length from 2" to 8 3/8".
They all work just fine.
On average the Smiths will tend to have the best triggers.
My N frame Model 28 is probably my favorite, but I have very large hands.
6" is way better for plinking or possible hunting, IMHO.
If it will be carried sometimes, then 4" would be better.
Depending on hand size, I would be looking for a classic used S&W L or N frame. The newer ones are just not as nice.
My FiL's GP100 is perfectly fine. It has a better than average trigger for that model. He shoots it very well.
I really like my 357 Blackhawk, but the OP already has those.
My two Taurus 357's are very nice, but they are older models. Like the S&W, I don't think the new ones are as good as the nicest older ones.