awe, its cute.
aww man! we almost won.
ahh! that was scary!
Ahh! Dinner is served.
If you're in awe, you're impressed.
You say aww because you're disappointed or because something is cute.
You say ahh because someone is giving you a massage and it feeeels soooo good.
Awe is primarily used as a noun, it's like an inspiring admiration for something.
ex. She stood in awe of the towering buildings.
Aww and Ahh are both exclamations.
Aww is usually a a bubbly, sentimental interjection.
ex. Aww! Your baby is so cute.
Ah is usually used to show fear, or dislike.
Ah! Real monsters!