[schade]

airbags well compete with or almost out preform any coilover kit except maybe a set of billstenes.

If you think about it its pretty much the same principal. You can control the amout of pressure that is at each wheel therefore improving your cornering. The one main advantage air ride has over coilovers is the ride quality. If you drive your car day in and day out, then there is nothing that can compete with a car riding on air.

The only draw back for an air setup is the amount of space required to install all the components. ie. the compressor and tank ( size well depend on if you want to be able to play around with the air pressures like hydraulics). The kits available for the focus are pretty much bolt on, so its really simple that way

my money would be on air.