I have owned both 1.0 and 1.3 model year 06 F package and 07 ill package.I can safely tell u that the 1.3 ltr is the best, ofcourse for a single person the 1.0 would do just fine but the engine is a bit noisy and rough, on the other hand the 1.3 carry four ppl easily with aircon plus the engine is much smoother.
The best part is that the 1.3 , 4 cylinder engine has no knocking which increases the life of the engine.
Fuel eco will be higher on the 1.3 only by 1km thats it!!!!