If you are foiling out a Commander deck, chasing a specific borderless mythic, or collecting every variant of a set, collector boosters concentrate those premium cards in a way that play boosters simply cannot match
However, most decks need a way to remove the opponent's stadium and stop them from gaining an advantage, and stadium cards can often be difficult to search from the deck
I can't more strenuously recommend Bant (or at least, not Sultai )
For my money, Animated Army is probably the Bloomburrow precon that has a strategy best suited to competitive play
With some tools like Crucible of Worlds, you get to do it every turn
What will I need to prepare in order to register for the Remote Duel Speed Duel Release Celebration tournament