That is the one area I believe Wyndham has an advantage over Worldmark. With Worldmark, from 90 days to 13 month before check in you have to book at least 7 nights for any red season. For a white or blue season, you can reserve less than 7 nights. For red season, you can book the 7 nights at more than one resort; but the 7 nights have to be consecutive.
To do that, WM owners may book a couple of days at the end or beginning of the 7 night period at a resort with very low points/small unit size to be able to book the 4 or 5 days at the resort they want. The couple of days can be used by a guest or just "thrown away."
You can also book stand-alone days like I described above.
The other problem with WM when booking very popular resorts at very popular times is that their 13 month booking is not a "hard" 13 months. WM owners can start booking ahead of 13 months up to a month ahead if they have enough points to book the whole month. What I have found for the "normal" WM owner is that the prime units at prime resorts, especially those with a small number of total units, are gone prior to the 13 month booking window.
With Wyndham, the 13 month booking window is "hard", no jumping the line like WM owners can do.
Actually, I have never jumped the line but I consider that an advantage. Because you can link different locations together in grouped reservations, usually you just have to pay only a little bit over if you don't jump the line. I would not hesitate to use that feature if I have to. I just haven't needed to.