Well of course Magnus would say that the serrated blade performs well....makes them money. Please understand, I like the company and I use Magnus products, but why would they shoot themself in the foot.
You asked which penetrates better....the answer is pretty clear on the poll as well as in the hunting community. Look, when we shoot compounds, penetration is less evident because of the high speeds todays amazing cams and limbs, but do some penetration tests with traditional equipment and the results are a little clearer (in my opinion. ) If you have the time google the Dr. Ashby report in regards to penetration and durability. This will give you some idea how various designs and blade angles play a role in real animal penetration. Much of the recent studies also credit the tip design to the overall durability of the head and thus the total penetration. Believe it or not, the long narrow single bevel blade, with a "tanto"tip design has been proven to be the best all around for traditional speeds. But with very high speed bows and less weight in the arrow most of the compound hunters shoot, maybe the chisel tip styles have some advantages. Test a few and let us know!