Garret bounty hunter platinum or Garrett AT pro

Hi All
Hi Guys I'm looking for a detector to find gold of all sizes but must be able to detect small nuggets.
Iv'e been looking at the Garrett bounty hunter platinum or Garret AT pro as they like good quality detectors
and also are in my price range, as this will be my first real detector I'm wanting to find what is there in the ground so i don't
lose interest. As i have a cheap one and have found nothing and started to lose interest but another guy went over the same area i did and found things
and advised me to buy a better quality one so I'm asking for some helpful advice from guys who have used these or know about them from others that have used them.
Thanks Guys looking forward to your advice an thoughts.
Thanks Brett