same was my case as in i was confused to between the two brabds but ny brother and brother in law had installed dunlop in their new cars and the result was rely satisfying so i preferred to go with the real life experience so alhamdulilah till now i m rely happy.
as far as the size is concerned, i just increased the width of the tyre to 195 but the radious remained the same, 195 looks amazing interms it lift the car a bit. i was stuck with 185 but the dealer as well as my brother convenced me for 195. i got both the sizes installed for comparison, bo t h didnt have much of a difference infact 195 looked better.