I don't know anything about Hilton Rewards...but DVC is primarily at WDW....exceptions being Vero Beach, Hilton Head....plus the planned Hawaii. They will be adding DVC to Disneyland as well.
With DVC you can trade into Interval International...but many post that DVC is more expensive than other timeshares, so you don't get the same value if you aren't looking to use it at DVC resorts most of the time.