What is the best yu-gi-oh structure deck

In my opinion, the best Structure Deck is Dragons Roar. It is a simple deck, based on the Red-Eyes Darkness Dragon with Armed Dragon support and a few smart spell and trap cards thrown in. Very easy to tailor it to your own style, and being a Dragon deck (dragons seem to be quite popular) it is easy to find the cards that suit your deck from the couple hundred of dragon cards that are out there. I started with this deck, it taught me about strategy, and how to win with effects, rather than just winning by superbly high attack.

The best deck is the Surge of Light deck. When Neo-parsah is summoned, with the help of the field card "Santuary of Light", it can do damage differences between its attack and the defense of the opponent's monster. Not only that it can raise its attack by the difference of the life points of the players. Other monsters in the deck have high attack power and pretty good effects, despite their low levels.