Ha...Easy Question Lexus..
Evan tho Toyota and lexus same manufacture

Many reviews have noted that both cars are very quiet to drive and have almost the same brakes. well, I'm currently looking to buy a car. Avalon and Es350 use the same engine but different exhausts. Which car would be more fun to drive and why?

avalon. parts are cheaper and more readily available.
even the low end lexus's have parts that are NOT compatible with the toyota counterpart, and they are priced more because lexus = luxary.

lexus duhh

the Lexus would be more fun to drive,even though both of them are built by the same company,the Lexus drives a lot better,the Avalon is a nice car but the Lexus would be the car to own,they handle good and ride good also,they combine sports car with luxury car,good luck with it.

A Lexus for sure. In some world markets the Avalon has become a dinosaur and has been dropped so resale value has nosedived