I don't really think these two cars can go hand in hand here in Pakistani auto market. Toyota launched these two cars simultaneously but aimed at two different market segments. Allion was considered to be bought more by young people in contrast with Premio which was targeted at mature age segment (which obviously means its got more goodies/bigger wheelbase etc.).
In Pakistan buyers don't really sort cars into such categories neither imported used cars are advertised here. People go to showroom, see both cars, find price difference alongwith features difference so they select premio. Hence the demand gap is created which results in low resale.