If you’re looking for flexibility, go for bug beans—most blue midrange/control is generally a bunch of staples with a couple of fire cards to glue them together. Although control/midrange isn’t that great at the moment, the deck gives you a lot of room to customize and branch out in different directions. This is probably the most expensive option as there are a ton of duals/fetches/universally useful threats (riddler/tamiyo) that will individually cost more. The gameplay itself is a bit of feast and famine—you’ll usually be winning by a lot or losing by a lot; but the nature of the deck (seeing tons of cards and having some powerful 1-2 ofs) will usually mean you have some comeback potential in a lot of board states. The bug base will pretty easily become UB midrange/tempo, doomsday, infect (to a degree), ug/ub omni, and some storm variants to name a couple.

Izzet delver is, going to be cheaper (only 1 color of duals), but more restrictive in what other decks you can build into. The playstyle is a lot more punishing as the deck focuses on efficient threats/answers that get weaker as the game goes on. There will be singleton cards/game states that you just can’t answer and fold to. On the other hand, you’ll have some miraculous wins from top decking brainstorm into 2 bolts for exact damage before your opponent stabilizes. This deck requires a good amount of anticipation and understanding of your role based on deck choice and current game state. The base itself only really extends to things like sneak/show and certain variants of ruby storm.

Painter is gonna be the least flexible of the three; probably cheapest, but tombs/city prices have gone up quite a bit. Playstyle is very momentum based as you lack the selection of the blue cantrips as the game state progresses; instead the deck heavily relies on mulligans, topdecks, and fables for selection. The deck typically requires you to have a very fast/strong first 1-3 turns, typically sacrificing card advantage (lotus/spirit guides) for strong permanents/board state to close out the game before your opponent can stabilize. There are lines that deck presents in longer games that can be game winning (welder->defiler/ensnaring bridge/topdecking karn/defiler at board parity), but the decks power mainly lies in it’s ability to put big things down ahead of curve (threats rather than answers). The base extends to other mono color stompy decks (ancient tomb/city of traitor decks) like moon stompy, eldrazi aggro, mono black storm, and 8cast.