When I had the Fre for my silver 7 Plus back in the day (a month ago, haha!), I had terrible oil slicks. It drives me nuts. I may go Nuud, but I don't want terrible sound quality that I've come to expect from the Lifeproof brand.
Nuud sound is probably best out of the three I have to compare to. Haven't had anyone ask me why they can't hear me with it. Sounds marginally better than Fre. *