I have stayed at the courtyard and the two Marriot hotels above the falls.
I get the package at the courtyard which includes breakfast and 40 dollar credit for dinner. the Keg is the restaurant and is probably the best chain in Canada. Breakfast is good. The dinner voucher will not cover two but goes a long way. the package usually also includes two cocktails and wine tasting vouchers for one of the wineries in Niagara on the Lake. The hotel is fine, the rooms are typical. the hotel is well located for walking to most Niagara tourist traps and the falls and casino.
The Niagara Marriot Gateway is nice but large, I was upgraded to a falls view room on twentieth floor and it was spectacular. The CL has a spectacular view as well.