For the same drive strength, the NAND-NOT combination needs less silicon space than the NOR solution.
Vice versa, by using your NOR solution on the same silicon area as the NAND-NOT combination, the NOR output has less drive strength.
However, if you don't mind about drive strength (or silicon area consumption), your NOR solution is probably faster than the NAND-NOT combination, because it needs just 1 gate delay to achieve the result, instead of 2 propagation delays for the NAND-NOT combination.