PVA for everything - superglue is far too tricky for my sausage fingers with bits this small.
Also it's very unforgiving as it bonds skin/mdf and mdf/mdf instantly...
PVA gives a strong but slow bond with a bit of flex so stops them getting knocked off too easily.
The 1mm MDF is surprisingly tough but it's got next to no strength in shear so the layers come apart.