Lets get something on the table here
Pressure and flow rate
Flow rate can be calculated by putting a 1 - 5 bucket under a faucet and timing how long it takes to fill it.
No big deal – Pressure is measured with no flow - which means very little if the feed pipe is very small
So when is this an issue?
My vote is flow rate – give a darn about pressure - this takes into account the pressure and possible restrictions
And what is a flow rate when we should flag the results. Remember that some A$$ might have put in a water saving valve or just reduced the shut down valve under the sink.
A little information here would help