Used to use an AMEX with Hilton (when I was at airlines), got a few stays free, but since I started the latest gig (corporate) we only do Marriotts unless there aren't any at our RON. I like getting the Marriott points (I am Platinum Elite so we get a lot) so I can get stuff on the marriott mall/skymall. Pay all expenses on the road and all my personal stuff too on that card so the points just add up like crazy.
Don't need hotel points for hotel stays as I don't take vacations. Not sure if Hilton cards offer points for anything other than hotel stays or miles, but I have no desire to travel on my days off so why would I want deals on hotels/airlines?
Just stayed at the Hilton Daytona Beach and it was a real dump. Only stayed there because it was on the beach, and of course with crummy Florida weather it was overcast.
Guess it just depends on what you value, points, miles, or whatever. I think both chains have to pretty close to the same quality/service since they are direct competitors.
I have heard that the Hyatt Starwood membership is pretty good too.