Thoughts on Mock vs Sample Exams from CFAI

Hey guys, about to order some sample or mock exams from the CFAI. Just wondering what your thoughts were on the level of difficulty between the 2. I would like to order the more difficult ones, to test my knowledge to a greater degree. All input is welcomed, thanks everyone

I would go mock, more questions, wears you out. I think they are the same in difficulty. I swear sample #2 is easier than #1 though.