A.What is the difference?
Literally Speaking, Each wire of cable is thick and single solid, could also
named as hard core wiring cable. However, wires in multi-stranded type is thin
and multiple, also could named as soft cable/flexible cable. Please
also see below picture for your reference.

B.Which is more suitable for decorating
houses.
a.In construction:multi-stranded wiring cable is better
As single solid wiring cable consists of
one thick copper wire, it is relatively stronger and harder so that it will be
more difficult for threading process.
b.Thermal Dissipation:multi-stranded wiring cable is better
It is made of multiple fine copper wire, and there have enough space among
these copper wires to get a better heat dissipation.
c.Easily oxidized or not: Single solid wiring cable is not easy to get oxidized.
For long-term use, partial copper wires in multi-stranded wiring cable
will get oxidized and broke, which will reduce its cross-sectional area and
lead to a higher safety risk. Single solid type does not have space inside,only its surface get oxidized, so it lives
longer lifetime.
d.Price:single solid wiring cable is with lower price.
It requires more procedures to produce multi-stranded wiring cable, that
is why.
In conclusion,single solid wiring cable is the winner
for its usage,if you are the house owner, we recommend you choose this type.
And multi-stranded wiring cable is the winner for its installation convenience,
installation technician prefer to choose this type.