The difference between different curriculums isn't really how much "easier" one is than another, or the type of testing scheme used. The difference is in how the information is grouped together.
Some schools will teach by dividing everything into courses like "micribiology", "pathology", "immunology", "pharmacology", etc (I believe this is what you mean by the traditional curriculum). Other schools will have classes like "circulation", "metabolism", "blood", etc. where information about microbiology and the like is interspersed and divided up by organ system. Which style is easier to learn really varies from student to student, but at the end of the day, all schools teach the same information, regardless of how they structure their curriculums. They will all test all of the material, and I seriously doubt that difficulty level varies much from one school to another.
If you are looking for a school where it is "easier" to do well, you may want to look more at schools' grading schemes than their curriculums. Many schools are pass/fail these days, and there are quite a few who do not curve medical grades - meaning that every student has the potential to honor a class...or fail it.