which is your prority to read,best sellers and classic books

which is your prority to read,best sellers and classic books?
I find best sellers more easy and more
interesting to read than classic books.
From an entertaimental prospective,it
is natural to choose best sellers,but
from a deeper intellectual angle,I
must read more classic books which
are sometimes not interesting at all.
I am confused about choosing books,
it goes back to the original point,
what purpose should we read books
for?for elevation of myself or
just for pleasure?