With the resort fee I'd guess tropicana. Luxor has a $22 resort fee. Tropicana's is around $19 I'm going to vegas around the same dates and I hate to say this but there are some killer deals on the hotel's Facebook and Twitter pages. They're offering up to 50% off rooms + $25-100 in resort credit. Mandalay Bay is what I ended up booking for 1/2-1/4 and you have to use the link on twitter otherwise you won't get as big of a discount.