Best:
English (It's my main so I'm being bias

)
French

Spanish
Brazilian Portuguese
Korean
Japanese
Worst:
Thai - My personal WOAT. Too whiny. I like watching foreign content but Thai media took a while to get used to hearing. Their written language looks cool tho.
Hindi
German - Sounds mad demonic to me.
Haitian Kreyol - I've seen a youtube comment that said no matter what the situation it sounds like someone is about to get killed when listening to a Haitian convo. Even though I'm Haitian myself I agree.