"The Vocabulary Builder Workbook" or "Merriam-Webster's Vocabulary Builder"

Which one do you recommend?

Thanks in advance.

Question

"The Vocabulary Builder Workbook" or "Merriam-Webster's Vocabulary Builder"

Which one do you recommend?

Thanks in advance.

Answer

other than those above

Answer

I will recommend you to get an app!!! I liked the app which comes up with daily words, which will definitely improve your language to an individual level!!! 
So better get an app "Merriam-webster."

Answer

Or is there any vocabulary book you would recommend other than those above?