Hinged doors are often seen as more desirable for technicians and installers because most will lock into place when lifted. Ultimately, this allows for easier access to the outlets within, without the need to constantly re-position the lid when attempting to repair or adjust the floor box.
Recently, some manufacturers have even implemented a feature that raises the outlets within when the hinged doors are locked into place; making it easier for workers to reach the necessary outlets. On the other hand, lifting lids often do not lock into place which can make it more of a hassle for technicians to work on the floor boxes.
From a general consumer standpoint, both are perfectly viable options for floor boxes. Especially in residential areas, the type of lid chosen is a decision of preference rather than practicality.