Probably the most important question is,
what bands and distances are you most
interested in working?
Every antenna involves a set of trade-offs,
and each ham will have a different set of
operating preferences with respect to bands,
modes, time of day, and what stations they
are most interested in working. All of those
need to be factored into choosing an antenna
that will work satisfactorily for your interests.
If your interest is chatting with locals, on
80m, then one of the longer wires will certainly
work better. For working DX on 20m, the
vertical by itself may be better (although
improving the ground system will help).
On 10m, the longer wires will be noticeably
directional (with maximum radiation more
off the ends rather than broadside to the
wire), so if you are interested in a specific
direction then you will want to make sure the
wire is oriented accordingly.
Generally I’d probably choose the ~85’ wire
as a reasonable starting point, using two
supports rather than a sloper configuration.
But that choice is based on my personal
operating preferences, not yours.
I’d also try to improve the ground system
by adding radials, and consider putting a
tuner at the wire feedpoint, even if it meant
having to walk out to the antenna to switch
bands, rather than using the unun with a
tuner in the shack. But, again, as a QRP
operator I’ve always wanted reasonable
efficiency from my antennas: running
100 watts you likely will radiate more
power with just about any antenna than
I do with 5 watts to an optimized antenna.
That’s another example of how personal
operating preferences make a difference
in antenna selection.
Edited to add:
Looking at the description of the antenna,
I notice the manufacturer says the SWR is
1.5 : 1 on 80m, but it requires a wide-range
external tuner. That might be a clue that
the technical specifications should be taken
a pinch of a large bag of salt.