I like Marriott and Starwood. Used to belong to Hilton but couldn't understand why they thought their hotels were worth 30k points for a single night. Marriott is great once you get to Gold level as you will get free upgrade to the concierge level which is very nice overseas. I like Starwood for the Cash and Points program which allows you to spend less points if you want to spend a little cash. Also with Starwood you can trade your points for air miles and on some airlines they give you bonus miles. I recently cashed in 40k Starwood points for 50k Alaska Air miles.