I do believe there is a better "balance" with 2. Think of a circle revolving around the head. If it can stop at one ear and provide some amplification, and do so at the other ear, then it balances out sound. I wore 2 hearing aids all my life until one broke about 3 years ago, and I did not have money to replace it. So I got by (barely) with just one for nearly 3 years, and just got a brand new one to replace the broken one. So I now wear 2 again, and the result is added amplification, but sounds come across more balanced. Not just hearing things on one side or the other. I truly notice the difference with things like music and outdoor sounds; I can hear a truck behind me regardless of where it is (versus a truck being behind my left side where I had just the one hearing aid; if it had been on the right side, I would not have heard it at the same distance, I do not believe. The hearing aid microphone positioning does play a big role.)