Al -
It is all a matter of "FOCUS". Me - I take the miles at Marriott (into AAdvantage as you might have guessed) because I feel Hilton & Hyatt have better hotel LOCATIONS for "freebies". Wife and I are partial to Hawaii for the freebie trip.
Oh yes, back to "focus". The way I got to Lifetime Platinum (actually 2.3 million miles to date) is to pour every mile into AAdvantage that I can earn.
Since Hilton has the "Double Dip" I can "focus" AND get free stays in Hawaii BOTH.

For Hyatt, I take enough points just to cover a trip to Kuai'i once every two years or so, and then I put all the rest of the Hyatt stays into AAdvantage.
d
AAvid -