the alloys have a more aggressive offset, and wider track, giving the car a more sporty stance.....plus they suit the rubber bumpers better IMHO
Besides, having alternated both over the years, the wires are harder to clean and never stay in tune due to our nice roads
The alloys are very strong and have taken a lot of abuse, and improve the handling
Wires only look good on Jaguars and Aston Martins