Reitveld analysis will give result of phase changes in cement samples while XRF only gives elemental compositions in a system so better to go for XRD

XRF gives elemental composition of the sample and XRD provide compounds formed after reaction in the sample.

Quantitative xrda give the best results. Keep in mind though that crystalline phases only are identified while the major proportion of the hydration products is amorphous, therefore the crystalline products are over-estimated. I always request quantitative xrda including amorphous content. Uncertainty exists about the accuracy of amorphous content determination by quantitative xrda.