I own Wyndham and I am now looking at Worldmark.. here are some of the differences I see
1) Most of the Wyndham resorts are in the east, most worldmark in the west
2) Worldmark mf is cheaper, but its more expensive to buy in
3) Worldmark is a club (no deeds) Wyndham for the most part is deeded
4) Worldmark hasnt added many new resorts in the last several years, Wyndham is growing
5) worldmark is selling on the secondary market for about 20% of retail. Wyndham is less
6) One Worldmark owner can transfer credits to another, and the going rate is about mf..and there is a very active markrtplace for these "one time use credits" so you can buy a small package of points and vacation large. Wyndham doesnt allow these inter owner transfers
7) worldmark allows short stays and check in any day
8)WYndham has an advance reservation priority at your home resort,, The concept of home resort doesnt exist in Worldmark..
9) Wyndham charges guest fees worldmark does not
Heres a real world comparison
Wyndham and Worldmark both have buildings in San Francisco Wyndhan requires 300000 points for a week in a one bedroom. worldmark 11500 credits
at $5/1000 points mf a wyndham owner will pay $1500 for a week, a worldmark owner with a 12500 credit account will spend $725 and have enough credits left over for an 8th night
My usual advice when considering a timeshare purchase is to consider where you want to vacation and buy there. I wanted resorts close to my home, so that means Wyndham is best for me...but I really like what Im learning about Worldmark and have contracted to buy a small package of credits...I will be using them in SanFrancisco when I visit my daughter...actually I'll stay in my daughters home with the grandkids and let my daughter and her husband use the timeshare for a a couple of nights for themselves, in the city
There is a Worldmark owners forum,
here and an informative website run bu a Worldmark owner
here