Having NEVER even used an Explorer of any kind. I do not feel I am qualified to answer this question. But, and this is a big but, having owned and used the X-terra 70 for about 8 months now I can address this detector. I really love this detector! I am 58 now and not as in shape as I once was and the X70 is light enough for me to be able to swing all day. I find that 'depth' has so much to do with where and when one is hunting and the ground mineralization and many other variables as well, it would be my guess that the Explorer would be just slightly deeper than the X-70. It is possible that the Explorer may be just a little better on tid than the X-70. Now give this a little thought. The X-70 can be swung faster and is much lighter than the Explorer and there is where the real difference between these two detectors really is. Lets put this in perspectine. My personal opinion is that if I can cover more property and cover it for a longer period of time without wearing myself out I think I can find almost as much with the X-70 and feel good doing it. So the X-70 is for me! I have found pennies and dimes to depths of 9" in some very nasty parks. I mostly hunt for coins and hope for jewelry and the detector has never had any malfunctions. Yes, I do dig some unwanted targets and yes it sometimes doesnt stay solid on deeper objects but I have found more silver with this detector than any other I have owned over the past 28 years. I do very little beach hunting or relic hunting, but the X-70 should be good here as well. The batteries seem to last forever in the X-70 and that is also a big plus for me. I am not trying to say that either detector is better over the other, just that one MUST take all consideration and then determine which detector is better for him, or her rather than which detector is the best detector. If you take the world's best detector for an all day hunt but can only take it's weight for 1/2 day, then you do not have the best detector for you. Just my 2c worth. I'll stay with the X-terra 70. At least for a while!!!!