That depends on what you care about most
And as I noted above, Pokmon are also sorted by whether it is basic, or an evolution. An evolution of a Basic Pokmon is typically a stronger variant of its ancestor, and there can be up to two evolutions (called Stage 1 and Stage 2), although not all Pokmon have evolution cards that are currently playable
In order to earn money, if you lock the opponent's actions, you will have an advantage
The fact that a Pokmon card could fetch such an astronomical price range, from 1 million to 2 million dollars, is a testament to the enduring and ever-growing popularity of the franchise
The issue, then, is not as much justifying playing Boseiju in those decks, but rather featuring it in a Cube at all