There's not a big difference, the GPUs are almost at the same level (750M slightly faster), so are the CPUs although the i7 is again a bit faster, however Acer quality is not the best.
As already said, the differences are minimal. If the HP is cheaper, I'd take it since the quality here is better. If not, take the Acer but be careful, don't toss it around too much and the keys are very sensitive, too