There isn't one. It is basicly what kind of deck you are comfartable with. Though that there are some kinds of deck that are consider as the "stronger" kind of card such as BF, lightsworn, or the frog deck.
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bubble beat
exodia
Most likely a vanilla beatdown deck
The best deck to stop kagemaru is one that does damage to him when he use's any of the three decks.
If you have a deck that needs monsters sent to the graveyard like a lightsworn deck, then you might win.