On the casino offers section of my Harrah's total rewards website, they seem to offer codes for "free nights at xxx" casino. If I book it, the website shows as "Free" for the price. If I book the regular way, (without the offer) it comes up as "COMP" for the price.

My question: Is there a difference between the two? Does "Free" vs "Comp" have any advantage over the other, or is a comp a comp?

thanks....