Hilton HHonors - HH Diamond or SPG Platinum?

I will not accrue enough hotel stays to maintain both HH Diamond and SPG Platinum Preferred. I am familiar with Diamond but I only recently obtained the SPG status, and will be losing one of them. Who has benefited from each of the programs enough to help me make an informed decision?

with a great link to a thead comparing the programs

http://flyertalk.com/forum/showthread.php?t=755557

I am closing this one

thanks

squeakr

MOD Hilton