From experience the professional line is a tad quieter than the classics. If the filters are in a cabinet there won't be a difference.
The professional is also easier to disconnect and clean. Something similar can be achieved with the included taps that come with the classic line, but you still have to remove biomedia to get to the sponges.
The classic line are workhorses. They provide more flow (for the same rating) and have less points of failure. When well maintained they should not be loud. Troubles can include blocked intake, untight connnection (draws air in), hose transmits vibrations in the cabinet which acts as a large subwoofer.
Keep an eye on the hose sizes needed, especially if you want to retrofit with glassware or steel.
I always like 2 filters on large aquariums. You can clean one and keep the other running with intact bacteria. You also get more configuration on the flow pattern. For planted aquariums the other advantage is that you get a weaker flow with the same amount moved. , no need to bend the plants near the filter outlet.
On hiatus till later this year