I feel it is very important to learn to fly in a machine that requires good positive throttle responses like the B47 and 300. In our experience when putting on people that have learnt in R22's their throttle control is absolutly pathetic.[thank god for dual controls] We always have to spend a lot of time and money bringing them up to our standard. Also what happens to a Robbo trained pilot during a govenor failure in say a B206 ,will their responses be automatic, I think not. The best thing I can suggest in my humble opinion is to ring up future employers and ask them what they are looking for. I will bet that you get a huge range of answers about this type or that type but in the end that is up to you to sort out. (we prefere B47 trained pilots here)
Good luck and fly safe
Rotor1