I just did a quick SPG vs HH. I don't know if I am completely off here as I did it in a rush. But I think the grass is not greener at starwood.

HH:
80k points / nights
rate = $350
value 0.4 cents / point
This means 7 cents per dollar spent on hilton property as Gold (double dipping points and points, if not double dipping then 6 cents per dollar).

SPG:
25k points
rate = $350 dollars
value of 1.4 cents / point
4.2 cents per dollar spent on SPG property as Gold

I did not use property vs property comparison, I just took a hypothetical value of a higher end Hilton and SPG as $350 and used an almost top rate at hilton and second to highest at SPG.