Infiniti seems to retain more of that, umm, I can't really think of the exact appropriate word I want. But a Lexus is a great car, but they mute almost all of the sounds, including the engine, and add tons of safety features that can be intrusive. While Infiniti still lets you hear the engine and have a greater feel for the road. I hope this makes sense to someone 🙂
Regardless though, they're both great cars and you really can't go wrong with one over the other.