I’ve had my S&W Model 29 for Decades. 6-1/2” Barrel, 44 Mag.
My favorite Pistol. Grip is just right for my hand and it is pretty accurate, though I’m no Dirty Harry. LOL
IMHO - Short Barrel if you Carry, Long Barrel for Fun.
I hear you. This gun will probably be for fun and to sit on the night stand, which points towards six inch.
No problem with a six inch for carry, if you do not need to conceal it.