being a member.....by a wide margin
Being a diamond Member vs Reading 4~5 books

Diamond member has a lot more interactivity with guides and stuff, also videos > books in terms of learning.
Off course 4-5 books can be sweet too and you can learn the same from it, but it will probably take longer term because you have to play out books on a chessboard if you want to learn something good from it.
Which one do you recommend for 1450~1550 player?