Manhattan vs verbal grail

[Char123]

RCs aside, how would you guys compare the difficulty of te practice questions from the two books?i did all the sentence equivalence and text completion questions from verbal grail and almost aced it. There is not a lot of obscure vocab...but it seemed way too easy.
On the other hand, I took a look at manhattan questions and the words are much more obscure. I'm even having difficulties with some of the problems under the easy difficulty. I do not notice a huge increase in difficulty in Mahattans easy to hard difficulty levels.

Has anyone used both books and have had similar experiences?