Several things have prompted us to switch from Marriott as our choice of hotel brand to the Hilton brand.
First it was the mattresses. Two days on the 4" mattress and I'm in pain.
Other things included the failure to get points for Marriott timeshare referrals that resulted in purchases, lack of follow through on a "walk" situation and a snooty front desk clerk. Irritations were piling up and wore our loyalty thin enough to get a couple HHonors cards.
Since we're doing comparisons we should probably look into the Starwood and Hyatt programs.