release strategy indicator difference

hi all,

1)after testing some scenarios in dev server i have not found the difference between these release indicators.

4 Changeable, new release in case of new strat. or val. change

5 Changeable, new release if new strategy/outputted

pls tell me the difference in betwen them?

2)what indicator should i select so that whatever changes done in po will determine the new strategy.

pls suggest

regards

sumit