Even if your ECs are "great", your chances at getting into a top school with a 32 or 33 (barring specific circumstances) are still going to be quite slim. Obviously not everyone can get into a top med school, but, if we're assuming a limited amount of time and resources, I would put my money on the 3.9/35 with a research background but no publications vs a 3.6/32 with a Nature publication or who did TFA or something. Of course, the most likely scenario is that neither gets in, but the former still has a better chance. Numbers won't get you in by themselves, but they absolutely can keep you out.