Welcome to the Sonoma forum.. lots of good food on this plan, that's for sure.
You do not have to follow the meal plans given in the book.. they are only a suggestion. You can always use the pull out cards in the book that list the things you can eat on Wave 1 to make your own menus. We also have lots of Wave specific recipes in the Sonoma recipe forum at the top of the main Sonoma page.
I cannot comment on WW since I've never done the plan. Might be a good idea to post that question in one of the WW forums here at 3fc since you'll get a lot off WWers to reply.