Stethoscope Recommendations?

Hello everyone!
I have just graduated from an RN program and will be starting on a Pulmonary unit. I am wondering if there is a stethoscope out there that is any better than another in order to hear all of the different lung sounds. I really don't like the one I used through school. I have heard the Ultrascopes are better to hear from than Littman. Does anyone know if this is the case? TIA!