What is better UWorld or Kaplan?
The only materials UWorld offers are its practice questions and, at higher price tiers, access to one to two 100-question practice tests. Kaplan is the clear winner here in a landslide.
What is harder UWorld or Kaplan?
During my studying and tutoring experience for Step 1, I have found that Kaplan questions are either extremely straightforward or much more difficult and focused on minutia than UWorld. Both my and my tutees' Kaplan scores have typically been lower than UWorld scores.