Mateja is right, power creep has gone insane since Awakening and Cosmic talismans paired with powerful 5 sets like Niflheim Yggsadril etc. Clan rewards are far superior to anything Arena or Gauntlet offers. The right clan can bring you up to speed quickly on team building and provide clan talisman sets that really are important. New overpowered content is rapidly introduced and can make what you just spent resources grinding for obsolete. I would focus on what this month brings and chase down a productive clan that hits S ranking each week at least so you start building up newer important talisman sets & Cosmics.