Which do I believe…..

I got round to checking the tyre pressures as I was told by the cars computer. I checked them with the air line from my compressor to the correct pressure and then used the pressure gauge as I don’t always trust the air line. All, as expected, slightly high so adjusted back down to 2.2 & 2.4 bar (rear/front). Then did the reset by driving a couple of miles.

Then checked on the computer to find I had 3 at 2 bar and 1 at 1.9 bar.

So which is right computer or mechanical tyre pressure gauge? (They were done when cold if that’s possible in this weather)