Hydralic lifters with rockers vs mechanical

Is there any kind of advantage on changing rockers to the 273 adjustable ones when using hyd lifters? Someone told me the gyeamtry is diffrent and more lift obtainable out of the mechanical rockers. Any truth to this? Or would it be a wate of time since car runs great now? Im gonna stay with the hyd lifters just possibly change the rockers if its not a waste of time.