336 wheels on x5

[kingloose]

Hi

I have purchased 2012 x5 with sport and 336 style rims with 20 bridgestones. I love the look of the truck and would like to keep it however my wife thinks its harsher than 19 as i had 2008 x5 with 19 RTF before and she thinks 2008 truck was softer. I have 2 options and would like to see if anyone can comment on this or has done this

Option 1 So i am looking to change up the 20's for 19. Is there anything i need to know or just buy and mount ?

Option 2 replace the bridgestone with non runflats (michelin / continental / toyo proxies ) does anyone know how it will impact the ride / handling ?

thanks in a advance for your input.