You are comparing two different things, the otis kit is for cleaning the entire weapon(it can clean most weapons) the bore snake is just for the bore, and you have to buy it based on the caliber of the weapon.
My concern with the otis kit is the plastic covered cable. Unless you are careful you will certainly drag the cable across the rifling at the crown. Seems like this could be a wear point like using a rod without a guide. Maybe I'm all wet, but it seems that the fabric on the bore snake would be safer in this regard.
bore snake works great in ahot barrel, and fits in your pocket, also has more surface area than a patch. But , for all out cleaning at the house I use the one peice coated rod with attachments and patches with solvent.
I wouldn't use anything that has a chance of dragging the bore in my rifles. The old style dewey coated and 1 piece stainless rods are the way to go with a proper guide if you want to be sure of treating your barrel nice.