Thanks a lot!195/50R15 are the go-to size for most due in the UK to price and availability but the 185/55R15 offers a bit more comfort due to the higher sidewall.
Depends largely on the roads you drive, you should find the handling more precise with the slimmer 50 profile but would lose a little cushioning.
Totally depends on your needs and preferences.
I want to try a Toyo ProxesI run Toyo Proxies TR-1's 195/45/15 on mine and its not to bad the ride comfort.
Its sat on its arse though and what might feel stiff for some is just normal for me.