Talent show?

I ,am 15 and there is gonna be a talent show at my school...I am in a debate over which song to sing...I personally like tanya tucker lizzie and the rainman....i have been told i even sound like tanya tucker...my mom says i sing this b/c it's most likely to win...my stepmom on the hand says it is to old and i need to sing a taylor swift song...b/c people wanna hear me sing a that doesnt sound like somebody else, she says i sound to much like tanya tucker and that isnt what people want. So I need some other opinions. I thought that song choice can also show individuality...yes that song is old but that doesnt mean i dont sing it best out of my choices