Monocrystalline vs Polycrystalline cells

I need advice; I want to make my own solar panels, but found different cells, materials in the market, poly and mono crystalline, the mono is more expensive but its spec is better than that of the poly, based on someone experience what is recommendable?

Thanks

Bob1; Monocrystalline are more expensive but slightly more efficient, my personal recommendation is for polycrystalline, especially if it will be your first project, for more information go to:
http://www.engitek.com/solar-energy-solar-cells-photovoltaic-principles1.html