which one is best for useing?

Depends on why you need to use the cordless mouse. To my mind the cordless mouse is more of a security risk as it is easier to pick up the frequency outside a building, but I need a cordless when I am ill as I lie down to work. The cordless also has the advantage that my pesky Rosella birds can not chew through the cable. The biggest problem I have had apart from the mouse going beserk at times for no reason is that if you lose your temper and bang the table the mouse jumps onto the floor and there is no restraining cord to stop it falling, ooops!