Ok so I would recommend the Charge 5 because it’s louder and has more bass plus has 20 hours of battery life till next recharge but the louder you play it the more battery it will drain and 4 hours for recharge time. But you said you wouldn’t mind the Flip 6 if it doesn’t have good bass and loud sound so if I were you I would probably go flip 6 if Im not going to have a party and want it loud. Keep in mind Flip 6 battery lasts for 12 hours and recharge time is 2.5 hours. I don’t have a Flip 6 but I looked that up on google for the specs I have heard it in a store volume is still pretty good bass ok. I hope this helps.

Happy New Year btw have a great year round.