"Better" is a subjective term, so what I think is better may be different from you, and everyone else. I have handled the Smith, but never shot one. People that buy them seem to be satisfied with them. From what I read they get the job done.
I do have extensive experience with the Ruger MK II as I own four of them, a few for over 20 years. Yes, things like barrel length, and adjustable sights do matter. The Rugers are over built, will last a lifetime and are accurate, and reliable. The target versions (bull barrel, adjustable sights) are accurate out of the box, and can be made match accurate with a few simple, drop in mods from Volquartsen or Clark. The Rugers can be heavily modified with aftermarket parts if you so desire, but are fine stock also.
For me, the sweet spot in the Ruger MK II line is the 5.5 inch bull barrel, (KMK-512) target model. It is very accurate, but still a pistol that can be carried in the woods for plinking. However, my four inch bull barrel, target model (22/45 variation) is also very accurate, and a little more carry friendly with the polymer frame.
See if you can shoot both guns, and also throw the Browning Buckmark in the mix as that is what the Ruger is often compared.
Do not let the dissasembly, reassembly reputation of the Ruger dissaude you from buying one. If you follow the instructions it is easy, and there are tons of youtube videos with good advice that walk you through it step by step.