My opinion probably won't matter much because I already lived through med school and this poll is aimed at people that haven't even gotten in yet, but I say curriculum hands down.
Prestige and name brand sound nice at first but a good school curriculum that teaches you what is relevant to become a doctor in the real world is what you will take with you forever. Your school might have a high rank, but if they don't assign any time to teach you how to explore a patient, you will get screwed epic time in the real world.
The school I went to is high ranked but I don't like the new curriculum. They reduced Anatomy lab to just 1 hour 3 times a month, got rid of the subject of embryology and are pretty much about to get rid of physiology in favor of a gazillion religious and nutrition based courses that should be electives at best.
I do however put a bit more emphasis on the quality of the clinical rotations since some clinical courses will compensate and repeat knowledge of the core subjects you see in the first 2 years of med school. A really sucky rotation at a hospital where nobody teaches you anything will probably be the only time in your med student career you will ever rotate in x specialty. I wished I had more emphasis on interpreting ultrasounds when I rotated Radiology as a med student.
It's also true that a sucky rotation of x specialty might give you a bad impression of s specific specialty. I had a really poor OB/GYN rotation in my 3rd year and hated the specialty, had a second OB/GYN rotation at a different hospital where the teaching was better and liked it and really enjoyed rotating the real bling bling as an intern where I learned a ton of stuff.
School rank and average exam scores might not matter too much because school ranking is usually subjective (either because the list only cares about how much research a school does or ask people on the street that know squat which school they think is good so they only choose the most famous schools) and exam scores don't mean as much because while it means they have a strong curriculum, it also means the school has a huge attrition rate. Going there means you have a 50/50 chance of either getting great scores or failing out of med school which usually depends on how good of a test taker you are.
Fun thread though. Interesting results.