Cork or foam underlay is the best types of underlay for laminate flooring.
I laid down foam underlay under my laminate flooring which makes a great insulation as well as makes the laminate flooring feel much better to walk on.
However my friend laid down cork underlay under his laminate flooring and it is also pretty comfortable.
But from my experience I would recommend using foam underlay for the laminate flooring.
Laminate flooring is a very easy to install flooring which can improve the looks of your home and increase the value if done right.
Most pros use foam underlay for the laminate flooring but either cork or foam will work just great.