For your first bow I highly reccomend you NOT purchase one from Ebay or any other place where you can't shoot it first.

Having said that if you are still dead set on these two my choice would definetly not be the buckmaster bow.

I would talk your parents into taking you to a pro shop or two. Many will have beginner bow packages set up ready to go. The big advantage is that you can shoot them all and the staff can set the bow up properly to fit you.