You will find that doing Dip's (elbows wide out) can build the lower pec line just as well, if not better, for most BB'ers than Declines.. If doing the decline's, DB's would always be prefered over BB's for a better muscle recuitment and ROM, if muscle mass and impressive growth is the main concern.
Certain people have become dizzy & confused when doing declines. They remain that way even when they post on this site. Good Luck.