Similar to Martin, it came down to having instant torque delivery and general responsiveness. Car has plenty of low down grunt now, and power continues nicely higher in the revs. Ultimately, it's an expensive purchase either route (both transform the car) so if you don't have a clear preference in your mind perhaps give Abbey (I'd recommend these guys from my experience) or Fensport a call, and if their demo cars are avaliable it'll help you decide.