If your operating a high mineral or high junk area then by all means the the gpx models are the best, but if you were to work low mineral low trash ares like the ground I'm prospecting in then the gp3000 is the one to use
Stronger and more versatile than ever before, the Minelab GPX-4500 is unique in cutting edge gold finding technology offering features and performance levels that other manufacturers are yet to beat.