A fuller sound picture
If you hear equally well with both ears, sounds are more comfortable to listen to. You don't have to strain to hear, and sounds have the kind of clarity and depth that give you a sense of space and volume.
Imagine listening to your favorite program on the stereo. It has two amplifiers and two speakers, to give music and speech a natural depth. However, if only one amplifier and speaker is working, the sounds become shallow and flat.
If you should be wearing two hearing instruments but only wear one, you may also perceive sound in this way. Fortunately, your hearing care professional can correct this by fitting you with an instrument in both ears.