It all depends on the week
Buba only in mono and when SOA is not so common. I am a fan of Eggman but i dont run him on weeks with a lot of attack manip. A bit similar in how he plays out as a card like Azel or Greem or Gretchen. A big early round threat that people have to consider
Neither for a half deck, for mono obvious Buba takes the price.
If you go the mono route don't forget to bring one card that benefits from being stopped like ashiko if you don't want to autolose against soa. Personally not a fan of mono jungo it's so simple and limited.