If its on dantooine....the Sand people know ALL the backroutes and probably have it all mapped out in terms of effective battle positions and pinching points(of course the Jawas are on Dantooine as well, but they be rolling around all day in the Crawler, Sand cats would just outflank em and eventually configure a strategy on how to penetrate and murder em). If its on Endor....the advantage goes to the Ewoks and Jawas.