Dont think there is a wrong or right answer here. It depends upon circumstance. The following will make a difference, strength of wind, temp, altitude,restricted site, power available, weight of helicopter. Could go on and on. Personally I teach in a 300 to be have a ground speed of 40 kts with a rod of 500fpm at 500ft.At 200 ft start applying a bit of power this will reduce rod and fwd airspeed. keep that going to you get to the ground. That way there are no nasty surprises at the bottom. Dont forget we are teaching people to ulimately come into a restricted site ( otherwise go fly a plane) who wants to come in at 60 kts ? No time to see the wire line let alone allow the engine to arrest a high airspeed and possible high rod. As for vortex ring what ? Coming into land into wind no way, unless you have, zero wind, about 15 kts airspeed and 800 ft a minplus rod and pull an armful of power at the bottom.