you mean what German car you prefer, BMW is sporty Merc is luxury and comfortable, Audi manage between all of these and has the best interior, Porsche is too expensive and W/E you need is an option, even the dam door handle is an option so i Piwis Tester II suggest you forget about porsche, i have Audi S4 which is great in everyway, my brother has Merc and my dad drives BMW, and they alllll are good, but when you drive BMW, you cant drive any other car after it, cuz its the best in handeling but both audi and bmw nav systems are totally complicated and takes longer time to get used to more than lets say Mercedes, but if you thinking about porsche panamera, just go for CLS63.