Comment 2 & 3 leads to same factor & i greed that Pick up of Alto 1000 is better than Cultus 1000. But what do u mean by "Cultus Engine is fragile then Alto". I m sure it is not made by Glass or delicate material. Cultus comes with G10B, i think one of the best ecnomical Engines produced by Suzuki. The others plus point Cultus have over The Alto are as follows,
1 Cultus gives Max tourqe 8.5 Kg-m at 3000Rpm While Alto gives 8.5 Kg-m at 2500Rpm (The only Plus Point of Alto over Cultus)
2 Max out put power of both cars are same e.i. 55Bhp
3 Cultus have independant rear Suspension while alto have Isolated trailing link type. ( Independent is better)
4 Cultus have 13" wheel base while Alto have 12".
5 Cultus is more feul efficient than Alto.
6 Cultus have more road grip.
7 Cultus have better Driving posture & comfortable seats than Alto.
8 Transmiision system of Cultus is very smooth than Alto
9 Cultus is more spacious then Alto.
10 Cultus come with electric defoging System on rear Screen.
The last thing is Cultus 1000 & Alto 1000 are not in same calss.