They are also in order. Not every English duo is here, but only the ones I consistently see(or seen)
S tier -
Bren + Sideshow: GOAT
Pansy + hypoc: also goated
A tier -
seangares + ddk: Still miss them 😭
paperthin + Achilios: Wish they would be used more at international events.
B tier -
MitchMan + Tombizz: overhated imo, but they can get grating over the course of a series. Also show their biases the most. They have solid banter though.
C tier -
Doug + Balla: Both are great on their own. Doug is good at play by play, but can get too hype over nothing burgers sometimes. Not a fan of Balla as a caster, but I do like him as analyst. These guys together though are pretty whatever. They're not bad, but nothing special.
F tier -
Sully + Upmind: This one is for sure a hot take, but I find this duo unlistenable. Sully on his own I don't mind, but I cannot stand Upmind's play by play. Constantly hyping up plays like it's the last round of a major tournament.
Edit: Also, side note, really glad Rivington isn't casting anymore. Easily the worst caster. Thought he was terrible in League as well.