I own both Hilton and Wyndham. So I can compare them readily.
Where has HGVC has a pretty standard point system where most resort are the same season and number of points for size of units, but there is exceptions like Grand Waikikian, Grand Islander, NYC, and the new Barbados property. There are far more Platinum and Gold time in HGVC's system. There are very limited locations that even have a Bronze time. A few more have Silver time. So the points are a little more uniform.
In the Wyndham system there are some baselines for the old original resorts in the system, but there is much more variation in the points requirements. New resorts are often more points than the old levels. So you have to look at which resorts you want to go to. However Wyndham has a LOT more locations than HGVC does, as they are too concentrated in the same locations. So that is a plus for Wyndham. They are also located in a lot of locations that truly have seasonal demand. So if you can travel in the off season your points will go much farther. So it is worth taking a look at the points requirements for where you want to go
Here is a link to newest guide that has all the points by resorts.
http://www.nxtbook.com/nxtbooks/wyndham/plus_membersdirectory1819/index.php#/0
As a resale purchase you will NOT have access to the Club Pass and any of the Worldmark Properties. You will receive an allotment of Transactions and Housekeeping credits (HKC) based on your ownership. So unlike HGVC where you ONLY get HOME week fee free for reservations, with Wyndham you get an allotment. HGVC does not have a Housekeeping concept, but you have that with wyndham. If you take too many weekend trips you will run out of housekeeping units, and you will have to pay 2.25 per housekeeping credit required.
You get 1 Free transaction Per 77K in points,after your allotment is up it is $19 per ONLINE transaction. Costs more if you call. You also get 1 HKC per 1K of points owned. HKC are fixed based on unit size that is booked for the reservation. So it is possible on resale to have to pay for some extra Reservation Transactions and HKC. But reservations are cheaper than in the Hilton System, as they are $67 per reservation online.