If you're looking at the Ruger, check it over very carefully. There have been several posts here about problems with the GP-100 in .44 Special. Especially with poor front sight installation. In all fairness, I think Ruger has ironed out these bugs now.
I have a 1985 Charter Bulldog. Its a fine gun and shoots well.
But if you want the best .44, you gotta get a Smith and Wesson. I have six and all will shoot better than me.