CamiB, you may want to look through the Resort Directories of Interval International, RCI, etc. I think that you can access them w/o a password or membership.
Welk is, in my opinion, a decent trader and is well maintained. But they only have a half dozen or so resorts of their own. So you would be more dependent on exchanging. Their "drive to" locations include Escondido, Cathedral City (converted 1 BR apartments) and Northstar (Very nice but I'm not impressed with how they have been maintained and cleaned).
I own a number of Marriotts and I enjoy going to the several "drive to" locations including Newport Coast, Palm Desert (4 different resorts), Phoenix, Tahoe, Las Vegas (Grand Chateau), St. George, Maui, Kauai, Big Island, etc. Earlier this year I had to cancel St. Thomas USVI because of Covid. But the reason for me bringing up Marriott is (1) no one else did and (2) if you own a Marriott you get a 22 or 24 Day "Preference period" in Interval. For high demand places like Hawaii, that makes a whole lot of difference. I have exchanged into Newport Coast 10 years out of the past 12. Many (not Marriott owners) find it a challenging exchange. Also, because I own multiple units in the same season, I can reserve at the 13 month point, which can be helpful.
I own Desert Springs 1, Desert Springs 2 and Shadow Ridge Enclaves Deluxe. All trade well but the SR Enclaves Deluxe "sees" things that the others do not. Also, it "splits" into two 1-BR units rather than a 1 BR and efficiency. But they are a bit rare and seldom show up for sale. On ebay, tug2 and redweek, there are a lot of timeshares that are priced very low. This is a good time to buy.