Shower Pumps -Quietest?

[craig1912]

Currently have a cheap pump that's ok (think 1.5 bar). Have another shower whose electric on the wall pump unit is on its way out.
Want to replace both with one pump for both showers. Probably need a 3 bar one and have seen Salamander, Stuart Turner and Aqualizer.
Really want as quiet as I can get so does anyone have any real world experience of them and offer an opinion?
Many thanks