I think what you're really asking is, "how do I compare pumps"?
Pumps will have ratings, listed on the specifications sheet. I don't know what you're using this pump for, so I cannot steer you toward any specific product. However, I can tell you what I'd look for.
Flow. There should be a flow or throughput measurement. In the United States, this is usually described in gallons per minute. Basically, it tells you how much water goes through the pump. For a well pump, this site recommends at least 10GPM for residential and 20GPM for light commercial buildings.
Pressure. There will also be a pressure measurement. The US standard is pounds per square inch, or psi. Home plumbing systems need pressure of at least 10psi to successfully run a dishwasher or washing machine. You'll need higher pressure for other applications (for example, 40-60psi for residential sprinkler systems).
Loudness. This is measured in decibels (dBA). These measures are relative; this chart shows some comparisons: 20 dBA is the volume of leaves rustling; 60 dBA for normal conversation; 110 dBA for a car horn; 140 dBA for fireworks. A lower decibel rating will mean a quieter pump.
As an aside, many times it is possible to build an insulated housing around a pump to lessen the noise produced. Just make sure you still have adequate ventilation so it does not overheat.