They should both have about the same depth in theory, and both use the same coils.
Both detect the same range of conductivity, but the 250 "slices" that range into more
segments than the 150. So the ID can be a bit more accurate on the 250.
The 250 has 12 notches vs the 150's 5 notches. So the 250 has more ID resolution.
If you are digging everything, this may not be an issue.
The 150's depth indicator only reads to 6 inches, vs the 250's 8 inches.
But I don't know if the 250 actually detects any deeper or not. If it does, it's probably
not by much.
To me, the thing that really sets the 250 apart and makes it worth spending the
extra for is the pinpoint mode. You can tell almost exactly where the object is, vs it
being a little iffy one way or the other on the 150.
The machines normally run in a motion ID mode and that's not a very precise
way to pinpoint an object. Sure, you can still find them and dig them up, but it
will take a bit longer and you will likely dig bigger holes.
With the small sniper coil, this is not a big issue, but it can be on the stock coil,
and even more on the 9x12 coil.
But there is another advantage to having the 250 and it's pinpoint mode.
It gives you a true "non motion-all metal mode". This is where you constantly hear
the signals as you pass over the ground, vs only hearing the sporadic beeps when
in the normal motion ID mode. You have to keep the pinpoint button pushed in if
you want to use it like that.
Anyway, in your case, either one will do the job. But if money wasn't an issue I'd
spend the extra and get the 250. If nothing else, for the pinpoint mode.
But to answer your last question, either one is capable of finding the same metals
at about the same depths. It's just the 250 is easier and faster to use. And more
capable if you ever want to use the non motion mode.
I went with the 250, and glad I did now.. Not having the pinpoint mode would
drive me batty. That's my 29 cents worth anyway..
