II gives preference to a number of chains including Marriott, Disney Vacation Club, Four Seasons, Hyatt Vacation Club, Starwood, etc...but not Hilton. I have seen a number of summer and fall Sanibel weeks...and occasionally a late spring week...sitting online with II. So there are weeks available...and I have been able to see these with my non-HGVC weeks as well.
Personally, I never noticed a preference in RCI, either, but it's possible that it exists as you have been told. I have always thought that going through HGVC was the best way to get another HGVC resort on Sanibel. I have seen statistics that indicate this...but that was several years ago and I don't have them any longer. At any rate, you're not likely to get a Sanibel week from Christmas through early April using ANY exchange company. Certainly to count on it would be to set yourself up for disappointment more often than not.
Steve
Personally, I never noticed a preference in RCI, either, but it's possible that it exists as you have been told. I have always thought that going through HGVC was the best way to get another HGVC resort on Sanibel. I have seen statistics that indicate this...but that was several years ago and I don't have them any longer. At any rate, you're not likely to get a Sanibel week from Christmas through early April using ANY exchange company. Certainly to count on it would be to set yourself up for disappointment more often than not.
Steve