Drive some well maintained Cultus the clutch will be super soft. The steering of Cultus is hard than Alto though.
From comfort point of view frankly speaking both car's aren't comfortable but comparing Alto and Cultus. Cultus has better comfort for sure.
Cultus sticks to road better than Alto.
AC. I have found AC of Alto to be better than Cultus don't know if that was due to blower speed or what..
Alto has a bit modern interior than Cultus material is same in both no difference in that.
Fuel average well a carby and efi cultus both will give about 10-12 kmpl with AC in city driving without AC figures might go till 14kmpl in city. Whereas Alto i don't think so that will give above 10 kmpl with AC in city..
Cabin space and boot space without any doubt Cultus is winner in both these departments.
Spare part's more or less the price's are same.
Now it's like pick your winner at your own kind of thing..