Put the horizontal antenna up high and it works with either low
conductivity or high conductivity soils.

Same for the vertical.

Low height is the h azard for
the horizontal antenna if you want DX.

Yes, but even high, they aren't always the best choice on the low
bands.
In a way, I think the same can apply to the verticals. Low height is a
hazard for those too, unless you have a load of radials...:/ MK