I've never seen either of those shows, so can't be of any help there to you. But wanted to say, "Have a great time in L.Vegas"!!!
My son saw Cher and he loved her show. If you like Ventriloquist's, Terry Fator is going to be at the Mirage in February sometime. He won on the show America's got Talent (I think that's what it was called). He is really good.