asignments

[Arcinio Arauz]

What works best when we tie up a house:

1. a double escrow if title company will allow it

or
2. an assignment to assign the deal to an end buyer

One lady at one title company told me that assignment fees are paid only to brokers. That's why I generally do a double escrow.
Someone else tells me that if I can assign the deal to an end buyer, I stay further away from chain of title. Please explain and where can I find a document for this (assignment)?
thanks