Be careful, you can tell a timeshare salesman's lying if their lips are moving. "I used to work for Disney" is one of the lines they often use to get confidence when you mentioned
DVC. A timeshare salesperson doesn't have any inside track to RCI deposit knowledge. It sounds like you were talking to Wyndham, they have a great system but a more than questionable sales staff, certainly near the bottom in ethics and near the top in sales pressure. You can buy Wyndham or BG for pennies on the dollar. All timeshares are confusing including DVC but once you learn the system, many can be great options. I would not buy to trade to DVC but if you're on the fence, the option might be the deciding factor.
As to deciding which ones to consider, I'd start by thinking how I wanted to use it and where I wanted to go with it. As a rule I'd suggest you need a minimum volume of at least an average or a 2 BR a year to justify the option to break even. If I wanted to go to a specific location, I'd generally buy there if it's a high demand area during peak times. If I wanted to go to different places, a points mini system like Wyndham, Hilton, Worldmark, Diamond, Marriott or Bluegreen may be best. I'd then look at my level of expectation, unit size, quality demands, ease of use/guarantee and the like. Also how far out one has to reserve, for Wyndham it's 10 months minimum, for Marriott 12-13 months and for Bluegreen 11 months. Look at Budget. Marriott (weeks) is often best for those who demand higher quality and can travel a week at a time. Marriott points is expensive even for resale. Wyndham and BG are often best to get different places, get in cheaply and want to do some exchanging (both include RCI) but some of their resorts are better than others. Just spend enough time to figure out which system is likely best, then to learn about that system including resale options. Most, like DVC, have limits on resale and none I know of are reasonable to buy retail due to the issue one needs to now where they stand going in. Overall I prefer BG, but for many, Wyndham is the best option as a single choice. Nothing is perfect and most have the areas where they are the best.