I think the difference is slight until you get into the bigger enlargements like 8x10. I also use paper, which has much lower accutance than film of similar size.

I only made my own brass one because I didn't like how fragile the tinfoil was, and I couldn't find any thinner/better metal than 1/1000th inch brass. The prices on prefab ones is ridiculous, considering the spirit of pinhole is simplicity.