Slow n Low - The CatA/PC1 profiles are very proscriptive and exact in the way they must be flown to stay legal and guarantee the required outcome - they are not much use when it comes to non-CatA/PC1 arrival or departure profiles but they are often all you have to go on.
Height-loss graphs won't take into account obstacles and VTOSS is often much higher than a safe-single engine in level flight speed because it is calculated to give a climb following an engine failure. With our mil-style vertical departures (non catA/PC1) you are left to cuff figures and use experience of how the aircraft is flying to assess when to transition safely.