As the old saying goes, 2 heads are better than one and we could keep going with 2 hands, 2 legs, 2 eyes, 2 ears are better than 1, etc., etc.
But what are the actual advantages?
More Natural
The hearing becomes much more natural with sounds coming from all around you.
Safety
Being able to identify where the sound is coming from is only possible with 2 aids. Eg. which direction is a car or bus coming from when you are out and about in the street.
Speech
It is twice as easy to understand the words when others are speaking.
Conversation
It enables you to participate in conversations when there is noise around you.
Lazy ear
The unaided ear tends to lose its ability to hear and understand over time. Both ears needs to be kept active.
Relaxing
Hearing is less tiring and listening more pleasant.
Wider hearing range
A voice that’s barely heard at 3 meters with one ear can be heard up to 12 meters with two ears.
More comfortable
Listening to loud sounds