Hi there!
Have stayed at both, personally we love the fairfield, the convenience of it and the mini mart/pizza hut on the 3rd floor was great. Staff are amazing and very helpful and hotel and room were clean and tidy. My only negative was the outside corridors, they did create some noise with people coming and going that you just dont usually get in a standard 'hotel' like the Hilton. For some people thats an issue, for some its not!

The Hilton was nice, clean with good service, the starbucks was a plus and the restaurant serves good breakfast!
Whichever you chose have a great trip!