which one is better and my Mercedes or BMW

I have had both. Generally - pricing, quality, fuel mileage and performance are about the same (comparing like models to like models). It comes down to whose styling do you like the best. Assuming all else is equal - probably the only difference that you will find is that all Mercedes models tend to have a softer and more luxurious ride than the comparable BMW models.

BMW drivers have been confirmed as the most aggressive and self important in two studies. One in the US, the other in the UK. I have always known this, so it was heartwarming to me to learn I was right. Not just in one study, but two. Go for the Benz. You'll love it, and won't be hated by almost everyone else on the road. Oh, blue BMW S were voted worst of the worst.

Both cars are great. I have a E350, 4door coupe, and personally prefer a Mercedes. My friend has a 2018 custom made 2door convertible Mercedes. She prefers a BMW. So it is a matter of personal choice.