Korban I can't help you as far as the Tesoro goes. The XTERRA 30 is a good turn and go machine but for me I went with the XTERRA 50 due to the extra features, manual ground balance which helps due to the various ground conditions such as iron ore infested red clay to sugar sand. Also it has more discrimination segments. More sensitivity segments. Noise cancel in case you are hunting next to another detector or high voltage lines. Also the 50 will accommodate extra coils. The best thing to do is to go to the Minelab site there you will get a direct comparison chart that should help you decide if you want the extra features. Check out various reviews and field test. Hope this helps and is not too vague.