Rather than opting for a straight-up best deck, you should base your choice on your familiarity with the game, or your play style, so we've pointed out which deck suits which type of duellist
9 Dinosaurs Rage Before Dinosaurs Ruled Yu-Gi-Oh
While originally ran with tons of traps and other cards to trade 1-for-1 to ensure you were winning the resource war, this archetype only began to truly shine with the release of the first Machina Structure deck, bringing Machina Fortress into the game
Both are playable, but Fated Return is really exciting to think about, to work with, to explore, while Pain Seer is just this guy that might go in some black aggro deck (but very likely wont and is just plain overrated due to his resemble to his far more charming cousin Bob)
We've tested our premium deck boxes to their limits to ensure they are safe for your most prized cards