Based on our observations, we think that the final solutions would benefit by having alternate viewing modes, which may be more suited for different conditions. In fact, hybrid solutions may be the ones which will get accepted not only due to their flexibility but also because they offer wider ranges of customization. A surgical technique or a particular surgeon may opt for VR in a particular phase of the surgery because of need for precise measurement of the absolute size of an anatomical target; another one may prefer the AR because of its ability of localizing the target within patient’s anatomical context.