Two Ponytail

If I remember correctly, by three objects you mean duplicating the scalp to have a base mesh from which to grow the hair out. I'd say yes, three objects is a good approach. Kent will probably have a better answer for you when he answers your question.  

Yes, as Omar says, I would use recommend separate emitter objects for each ponytail. It will give you better control which is important for high-fidelity portraits.