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Which works better if you’re going for thin line precision work?

That can change depending on the formulation of the paint you're trying to do thin line precision work WITH. Some paints will perform best with normal thinning; some will respond better with flow enhancer, and others will respond better with drying retardant. So it's 'all of the above... depending.' You just have to test things out and figure out what works.

Depends on the properties of your paint.

If it's drying on the brush before you can get it onto the model, retarder. If the pigment is breaking up or you can't get a thin enough line, flow improver. If both are an issue, both may help. For very thin linework I like mixing acrylic ink with my paint to help thin without losing colour intensity.