i wonder if the cultus ecu can be remapped, suzuki has a different interface so the cheapo scanners don't work on their cars.
efi cars do have better tunability but that stuff is expensive. if you compare a carby cultus with the efi, i think the stock cultus can be adjusted more easily.
but offcourse the efi one can be done too, just needs the equipment.
lets say i want to adjust my car
case 1, my cultus is carby
i want power, i adjust mixture, test drive, readjust...repeat until it is maxed out
case 2, my cultus is efi
go to dealer, find out whether it can be adjusted or not, get it re adjusted, drive , not happy...go again to dealer...repeat
or
find out you need some ecu mod to allow messing with maps (usually a person like me who doesn't have a big budget would say, i can live like this)
though if you want to get alot of hp from the same block, then efi would be the obvious route.