Better handling, better response, also with the EDFC you can have various setups,like race, drag and street, so you can adust setup from inside your car. Also and this is not general concensous but the arches on the Z in my opinion look a tad too high, hence you can lower the car so aesthetically it sits better, whilst improving your performance. Better sus will probabley be the best mod you do without going FI
Just my opinions