UWorld MCAT has been out for about a year now. While I can’t compare it to Kaplan, I will say it was the best resource I used aside from AAMC materials. I would highly recommend you at least try the 15 day trial, which includes ~1500 questions.
I thought that some of the biology passages were challenging, but it was overall good preparation and review. The main benefit of UWorld is the detail for their explanations, which is where AAMC matierials severly lack. I am a very visual learner, so the diagrams in the explanations helped a bunch with concepts.