Which rim size and chip for the S60 T5, experience?

I have tried 8×19 Et35 from a friend and they looked really good. However, I ask myself what looks better for a rim 8/8,5 x19 or just with some bodywork 9 and 10,5×18 the price come the rims with tires come about immediately only with the 18s come still pulling, possibly repainting to it… Somehow I like the wider one better, but I don’t want to have it faded Besides, I’m looking for a chip for the T5 come into question only well-known tuners like MR or Heico… Now I’ve looked in google times and according to the car image the T5 with Heicochip got better values like MR’s because the MR didn’t bring the power to the road… Therefore I ask myself which one is better served with, the ca 20hp more at MR would be very irritating. But if one brings the power with the Heico better on the road that is probably the better solution. What do you have the experience with the chips and the rims with a wider power, I think about the rims with a little more