Marvin,
I guess that would depend on the random wire, how well it
performs. I can tell you that an 80 meter HamStick isn't the
'best' thing going by a long shot, either in normal mobile
use, or as you described. You would almost have to 'work at it'
to make some random wire antennas be as 'bad'. Then again,
'some' random wire antennas won't work as well as the Hamstick,
which is normal.
If the two buildings you talk about are anywhere near 65 feet
tall, then neither antenna will do particularly well (also
normal),
and any other antenna less well than if it were clear of
surrounding
buildings/objects. I can't say what the differences would be
and
neither can anyone else. Give one of the two a try and see what
happens. At least then you'll have a basis for comparison.
'Doc