Of the two, SPS are more demanding and less forgiving. As mentioned, SPS need plenty of flow, hight lighting (T5 or halide) and perfect water conditions. LPS are generally more forgiving, can thrive under anything from PC to halide, and tolerate different levels of flow.
Some examples of each (incase you didn't know)
SPS: usually end in "pora"; acropora, montipora, stylopora, poccillopora, etc
LPS: candy, torch, bubble, brain, etc
-Justin