Lower string tension = more power

Higher string tension = more control

A longer string (or string plane area) = more power

Lesser string density (fewer strings) = more power

More string density (more strings) = more control

Thinner string = more spin & feel

More elastic strings = more power

Generally, what will produce more power will also absorb more shock load at impact

Softer strings, or strings with a softer coating, tend to vibrate less.