Hi,
I am a Diamond HH member and have found a much cheaper rate on
booking.com trip.com than I have on Hilton.com. If I book through Hilton will I get all the same benefits? i.e. HH Points, Upgrade and all the benefits from Hotel with being a Diamond HH member?
Thanks
Edit: It was trip.com that I saw the cheaper room - never heard of them so will probs stay clear - but same questions till applies.

But
the cheapest points/night-earning Hilton rates aren't at hilton.com. They're at Hilton | MVP Travel. And since that's just an alternate Hilton site, anything booked starting there still earns points, nights, and any bonuses.
So if you want to save money and still earn points and nights, then use the MVP rates, not some third-party rates.