Wire wrap was believed to be a more reliable than solder I think - the forces used make a gas-tight weld between the wire
and the hard sharp-cornered square pins. Solder joints can be "dry" if moved during cooling and this isn't always detectable
by simple inspection. Also wire-wrap boards don't have traces that can crack, the wires all have some give if the thing flexes.
Wire wrap is horrible to do, staring at hundreds of sharp pointed pins just isn't pleasant at all. Soldering is far more
intuitive and relaxing I think!
[ Remember plenty of flux, always clean the bit, hot-enough iron (there is no substitute for a temperature-controlled iron IMO
If you are taking more than 2 or 3 seconds per joint something's probably wrong ]