I own and use both. They are pretty much equal for land detecting. I like the wireless headphones of the 800 so much I purchased Bounty Hunter wireless for the ATPRO. Going to the beach I have found gold with both, but the 800 wins hands down in salt water. The multi-frequency of the 800 in most cases is superior to the single frequency of the ATPRO at target IDing. Both have optional coils. I like using the 4.5" on the ATPro better than the 6" on the 800. Talk about dry sand beach coverage, it is hard to beat the 17" BIG NEL coil, if you can handle the extra weight. Each detector will shine in a certain environment over others. What really counts is which is works best in your environment, how well you learn to work with the detector knowing its strengths and weaknesses. Don't forget about comfort, headphones - wireless is my favorite unfortunately (at this time) none will work with the control box submerged, the extra cost of accessories i.e. waterproof headphones, optional coils and their availability. OH, did I say the best is the one you can afford and get to "KNOW" the best. Which ever one you decide on, spend the time to read the instructions, watch videos talk to other in your area.