Reasons why I believe diamond cleats are superior:
1) Grain crosses at a 30-40 degree angle, rather than 90 degrees, therefore less tendency to come loose from seasonal wood movement.
2) Much longer reinforcement per cleat; less cleats required.
3) Less stiffening, due to the shape and the way the edges are tapered.
4) Looks really pretty.
Of course square cleats have been used for centuries (as have diamonds), and they work ok. I just personally think diamonds are better, especially if the owner is female. (Private joke for Wayne)
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