Between two girl names. Need an honest opinion!

We are between the names Ariel and Charlotte. One will be the first name and the other will be the middle name but we have gone back and forth for months. Please let me know which one you like better. Thank you!!!

UPDATE: Wow, I am so grateful for all of your thoughtful responses! Thank you so much - this was extremely helpful. I will be sure to check in and let you know what we decide. Very thankful for this community.