Hi Sifu, wanna to ask you for some advice.

Recently I was approached by two agents, both quote my old house with value much higher than the rest. But both charge 3% fee and must authorise their company for 3 mths to sell my house exclusively, although net proceed is still above our expectation price.

So
1) is it worth to let only one agency to sell exclusively?
2) would they really able to sell the house quickly like what they claim? As they have more clients on hand

What are the cons if seller enter into this kind of 3 mths deal?
Or should I quote the price and contact openly and let any agent or interested buyer to contact me directly?