Personally with 44 mag, I think the longer is better.
My 29 in a 4" gets the most use . It carries well on my hip . I changed out the grips from the old style target grips to an old pair of PC magnas that I had on hand . I shoot everything from target loads to full magnum with it . It suits me now.
I can shoot full magnum loads in revolvers with shorter barrels, but I actually enjoy shooting full magnum loads in my 6.5" 629.
X2 on that. I can put 50 rounds through it without blinking an eye. Only thing that hurts is the hole in my wallet