I currently use hotels.com to book my hotels for work. I use hotels.com because every time I accumulate 10 nights of bookings I get a free night.
I stay in random hotels in metro Aus + NZ and only spend around 100 - 150 p/n where possible.
Is there a another booking site that people use which has a better reward system?
Personally, I like Orbitz's system. I find their prices (in US dollars) are consistently cheaper and they almost always have a 15% off coupon code on their website. If you use the app, you get 5% in orbucks that you can use for your next stay, I like getting the benefit sooner. Their prices almost always work out more than 5% cheaper than hotels.com so it is better value in my mind even though hotels.com are giving you effectively 10% on every stay. I gain the most benefit from the best price guarantee which you can claim at any time and they give you a $50 if you find it cheaper elsewhere. This works for me because I don't generally book hotels 10x in a year.