Getting my braces off next Month which should I get ?

Finally getting my braces off after 3 years. I had a really bad open bite, not so many crooked teeth or any cavities. Was really insecure about it. Not only that but I had a hard time sleeping because my tongue would stick out when I was in deep sleep, which made it hard for me to breathe, and swallow and I had a strong lisp. Just was wondering if I should get the permanent retainers or the removable ones. The removable ones would be free and the permanent ones would be $500