Which make is better, Lexus(luxurious version of Toyota), or Chevrolet? In Mechanical quality/dependability?

Toyota and Lexus are equally better in quality than Chevy. Our Toyota with 170,000 miles is still strong. I have known many Chevy's to experience problems early on. You're right, Lexus is the luxurious brand of Toyota, but they aren't necessarily more reliable than Toyota. They just have more technology, comfort, and safety features.