You may notice your new dehumidifier uses fewer amps to remove as much or more water than the older one. It also likely will operate at lower temperatures in a basement before the coils will frost up, rendering the unit no longer able to pull moisture from the air. Newer technology allows this, so you won't be sorry about getting a new one.
As for your older one being noisier, you might be able to improve that. If you trust yourself to work safely around house voltage when covers are off an appliance, remove the cabinet from the unit while unplugged. Then, making sure you avoid touching anything that's live, plug it in and turn it on, making sure the bucket is in contact with the microswitch which prevents overflow. With the unit running, see if you can determine what's vibrating. You can listen through a short length of garden hose or heater hose. Gently press against the noisy part with a stick of wood or a pencil and see if the vibration stops. If so, you can usually unplug the unit and figure out a way to stop vibration by wedging in a piece of thin wood or plastic wedge. Use your imagination for what to wedge in. Another way is sometimes the factory puts in too few screws to keep things solid. You can often drill a new hole for another sheet metal screw or two, making sure you don't drill a pilot hole into anyplace it shouldn't be! Good luck.