These are two different cars. You should choose one based on what your needs. One is a hybrid car with very low power, good brand name/image and possibly slightly bigger space than the VW. If you are one who want to save the environment and want something different, get the Lexus. Knowing Lexus, I am sure the build quality will be good but prepare to pay for the long term service cost as there will be no one who can service this car except Lexus itself.
The VW is a much more fun car with almost 160 HP twin turbo engine. It is the next best thing to GTI. The DSG gear box is fantastic. With a little tuning, it can even whack a 325i. The issuer for VW is there are too many Golf out there. I would prefer the Scirocco. In term of driving fun, there is no comparison. It is a driver's car.
If you want a boring car, good for environment and have your friend think that are are richer than you actually are, get the Lexus. If you enjoy driving, a fantastic gear box and can chase down a BMW or MB, get the Golf.