Selecting a aeration pump

[dsouzainc]

How do we select an aeration pump??
Below are examples on what specification of pumps online supplier provide

ELECTRICAL MAGNETIC AIR COMPRESSOR
Model: ACO-308
Power: 20W
Voltage: 110-120/220-240V
Frequency: 50/60Hz
Pressure: >0.018Mpa
Output: 45L/min
Noise: <60dB
Weight: 1.2kg
Size: 159×90×95mm

DC Compressor
Model: ACO-006D
Power: 35W
Voltage: DC 12V
Pressure: >0.08Mpa
Output: 80L/min
Weight: 2.8kg
Size: 231×112×156mm

what do we look for in the pump? is it the power,pressure,output,what kind of diffuser will be used,how many as well,etc....if possible please give detailed explanation as it would be helpful for my understanding and other who read this as well.

Tank size to be 96"x36"x36"

[bossteck]

My top 2 considerations would be power consumption (per unit output) and noise level.

[dsouzainc]

ok so what about depth of the tank and size of tank