Thick wavy hair grows differently from one person to the next and as it grows it develops it's own shape. This will obviously impact the exact style you will choose, but the premise remains the same.
Casual medium hairstyles are quick and easy to create, and with it being a medium length cut, this will let you tie your hair back if it gets in your way, and it also enables you to wear it up for a formal occasion.
Another reason to go for a medium length cut is that it will feel very soft around the face enabling you to have a style whereby the hair can cross your forehead in a sweep, and it will feel comfortable rather than annoying.
Adding layers to the hair will make you stand out in a crowd, not only this but layers are also very flattering.
Also with medium styles, there is less length meaning less weight, allowing the hair to bounce into shape easily. They are also easy to adapt to the newest fashions.
Medium styles are manageable and one of the best ways to maintain this style is by maintaining the layers, also look for products that can boost your hair and make sure you have your hair trimmed at least once to twice a month to avoid split-ends causing more damage to your hair.