most annoying: -air canada with its extremely long winded announcements about bob, transport canada, that they don't take cash, duty free, how you're going to be fed and hydrated, smoking is prohibited, ife is now activated just touch the screen please don't push it too hard it'll bother the pax in front of you, we are here for comfort and safety do call upon us but don't actually call upon us, all in minimum 2 languages (including one time french being spoke first between yyc-yvr ), if you're going to spain or japan or something you're getting 3x. china you'll get 4x and i imagine those del flights will have 4 maybe 5 (gotta speak Farsi to be safe right?).
-south african where the ancient ife isn't configured correct so if you have your own headphones plugged into its two prong outlet and turbulence hits, you get a VERY LOUD (painful) announcement in your ears where the fa reads 25-50 words off a script that you've already heard 3-4 times
-oz cx nh where they struggle reading english off the script
-ws where sometimes they talk so long the announcements go past when the cabin door opens

least: -ac during turbulence on long haul, they just say "seatbelts" then whatever the french (then punjab, then hindi) word is
-tk, they're brief even though announcements in 2x languages
-lan is also pretty good, i find those scl crews are pros. and i like spanish

honestly i don't mind the ua prerecorded announcements. better than ac where you have to hear the long winded superfluous announcement twice or more

well the bing noise exists for a reason

and honestly ac is the only airline that i know of that only says a single word (in however many languages)