Exclusivity and the RGV don't really go hand in hand. LOL
If you put some parameters around what you mean by "best" and "exclusive" you might get better feedback. By their nature, private clubs will be more exclusive, so Rancho Viejo, McAllen CC and Harlingen CC would be the "most exclusive" courses. Each of them have their deficiencies and MCC is about to be closed down for 9-12 months while they redo their greens and revamp several holes. I was told HCC had some issues with their greens that they are recovering from and they are suffering like the rest of the Valley from a lack of water. Last time I played Rancho (January '26) it was in great shape.
People think I'm an idiot or something, because all I do is cut lawns for a living.