Since I got my Super 12 and put it on the DFX, it's found more gold than my Excal...and I use the Excal more. Thing is, if the beach is sanded in, I have to use the Excal or my PI. But when I hit pockets of targets, with nails, tabs, sinkers, coins and the potential for gold, and the targets are not too deep, I want and like to use the DFX. I can program it for really fast recovery, Tone ID and the Signagraph will splash on the trash. Sometimes when there is tons of iron in close proximity, the Excal nulls too much. And then, I am not sure if I am missing targets.
All in all it's a loaded question.
Yes, a Minelab Excal or Explorer will go deeper than a Whites Prizm or Coinmaster.
No, a Minelab X-Terra 30 will not go deeper than a Whites DFX, MXT or PI Pro.
I think most of the experienced detectorists have either used or own an average of 6-8 detectors. (No, I did not do a poll..its a guess based on how many I used and had...and I think I am being conservative based on some of the other guys on the forums...and yes I am jealous when some of you have 15-20 of them !!!).
We realize that conditions, types of hunting, where the hunt is, what type of coil we use, time ( heck, sometimes I grab the Compadre for a quick hour hunt at the local park to clear my head), etc. make a BIG difference. We also realize that depth is a relative thing and lots of times it is not the most important factor.
I think from now on, whenever a post has a subject line of 'Which one is deeper ?', the standard answer should be ' I don't know...buy them both and let us know'.