I attend a lot of Sales Presentation for Worldmark and sometimes Club Wyndham. And of course they are always telling me that I need to add Club Wyndham to my portfolio.
But thus far I have found that I can book just about any Club Wyndham resort either using Club Pass or Wyndham rewards. And the cost of staying is less because the maintenance fees are less in WorldMark than they are in Club Wyndham even when paying the $99 fee.