CDP - Critical Decision Point
The difference is that in the Cat A profile CDP(S76A) is clearly defined (35 knots / 40' ) and comes with the Sikorsky (Nick Lappos) guarantee of success if flown correctly and the WAT chart for the profile is observed. (without exceeding any limits or use of transients, I might add)
The B profile has a variable DECISION POINT dependent on weight ,wind ,OAT, and obstacles etc. It comes with no guarantee from Sikorsky. The decision is all yours. You make the big bucks. But.......you better get it right....... for it is every bit as CRITICAL.
Cheers