One of the differences as mentioned by Chris is viscosity. The polyurea product, specifically the Repti-Shield product, is thin enough to be applied with a paint roller or used with spray equipment.

Here is what I have read:
Polyureas have extremely good tensile strength and elongation properties. If the wood flexes, so does the coating, better than epoxy in general.

Drop a wrench on an epoxy-coated surface and you may see fine spider-web cracks. It takes a bigger wrench to do the same thing on a polyurea-coated surface. That is because the polyurea coating is better at absorbing shock.

I think there is something about UV resistance as well. The polyureas are good with UV.
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Mark

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