1) Which Model is more fuel efficient?
Offcourse the 1.3L.
2) Which Model has better Prosmatec /AT Gear technology ?
1.5L works better but you wont notice the difference unless you have driven reborn Prosmatec.
3) Which model has more responsive to pick / acceleration /smooth drive ?
Offcourse 1.5L
The pathetic thing is that the 1.3L version is just price marginally low than the Aspire version and you will loose all the accessories if you will opt for then 1.3L.