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I mostly use Vallejo Air for everything.... A while ago I was trying to do airbrushing a white color scheme and all the whites / off whites were so chalky, chunky and splattery that I gave up on the idea and went with something else. I must have tried at least 4 - 5 different whites and off whites from the Vallejo range. Internet said that it is generally a problem with whites having large pigments.

Now I went back to try a clean white color scheme for Tau and through a happy accident I lost a lot of my paint and got myself an army painter warpaints white since the store didnt have vallejo air white in stock.

I am usually too lazy to thin down non-airbrush colors but went with this. I was expecting splattery transitions and my idea was to smooth things out with light grey glazes.

I am blown away, it's actually possible to create super smooth airbrush color fades with this white. It's so much better than the Vallejo white.

Is this generally the case that army painter has finer pigments?

It would make sense, if only because Army Painter bottle paints are notorious for poor coverage (i.e. very thin/watery). However people rarely complain about running them through airbrushes. Makes sense.

As far as I'm aware, all white hobbyist acrylic paints use titanium dioxide as the pigment, and yes, titanium white is a relatively chunky pigment that is more troublesome to get a smooth finish with.

If you're seeing differences in airbrush application, it could be differences in the binder, dilution, and/or pigment concentration, rather than the pigment itself. I'm currently airbrushing VMA White and haven't had any problems; the coverage and smoothness are fine.

What needle size are you using? Too small a needle could cause problems.