i find the overall performance of the 195/50's far superior to the 185/55, but its not always been a fair test as both times I've gone from firestone 185's to Michelin pe2 195's. once on a Williams and once on the 172. that for grip, turn in, feel, everything
don't find much difference in ride quality, maybe a tad harsher on the 50 profile but hardly noticeable imo with even standard suspension. but again perhaps not a true test as my cars are almost invariably 'tired'
the silly boost mobile doesn't count, so I don't factor this into the tyre test, its harsh and always on R888's = awesomeness!