Unless it's a tuned antenna such as one available from smiley antenna, or an old Motorola HT440/90 antenna (which features a BNC connector) you'll find the telescoping antenna will work much better than the crappy duck if it's the one that came with the radio....
Of course, since you have both, you could simply test the receive of your local weather stations to find out for yourself, but I see you are "2 lazy"..., just a joke btw.
-Josh