The 1.2 is quicker, but not by all that much. Not quite sure what ECU tuning they run over there, but here, the 1.2 suffers from a very noticeable dip in torque in the midrange that means the 1.0 is just as quick at any rpm below 4k.
Thus, from a practical point of view, unless you're a speed freak (and if you're buying a Spark, you're not), there's no reason to go up.
Haven't had a chance to compare economy, but I've heard tales of over 20 km/l for the 1.0 in steady running. The 1.2 isn't as economical.
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