This statement about PEX in Wiki is totally wrong.
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Greater water pressure at fixtures. Since PEX pipes typically have fewer sharp turns, there is greater water pressure at the sinks and showers and toilets where it is needed.""
No matter what size or type pipe the static water pressure will always be the same.
The flow is what changes due to friction loss in fittings and high velocity in long runs of pipe that is too small.
If you are losing flow/perceived as pressure at fixtures in and or around a house you are running to small a size pipe.
Any house should have at least 3/4 main pipes dropping down to 1/2 only at each faucet or other fixture.
I personally would run at least one inch from the meter even if the meter was 3/4 on a long run.
The other big mistake is not taking into consideration the house water when installing an irrigation system.
If it is taking all the water the house wont have any while it is running.
Seen that done by fly by night low bid installers.
Worth