I can speak in terms of the TJ trac-lock or as some call it trash lock. In general terms 9 out of 10 times on the street or on the trail your no better with it than without it. In fact to get it to work sometimes on the trail we have to pull the hand brake up a few clicks. Street wise I suppose it might help on say take off's from a light when its raining. As for rims, get which ever one you like better, I would look to see how much replacement tires are in both size's, that cost might help determine which to get.