The key consideration with basins is aesthetic. Basins, their cabinets and tapware are all ‘front of wall’ and can be easily changed or fixed should any problems arise.
Floor standing basin units will tend have more storage space and hide pipework if the only option for these is through the floor (rather than behind the wall).
Wall hung basins and cabinet units generally create the impression of space, and also enable easier cleaning of surrounding surfaces.
At Your Local Plumber we’d always go for the floor standing option if the space is available; 6/10.