They're making pretty good music, altough in my opinion AoD is just more creative.
Might want to check them out if you don't know them yet.

Plentakill makes more of some "parodies", if you could call them so.
The music is mostly about a single champ, but they did multiple champs like a Vayne/Lulu botlane too.
Aod makes their own kind of music, which is why the flow might seem a bit off sometimes, but you normally won't mind. Their music is normally about a character group(E.G Demacia) or a lore wise interaction (like TF/Graves).
They won the summoners song contest btw.