Solstice Park, A303 at Amesbury is my local one and the only one I've used more than once so it has to be my favourite. Located in the Holiday Inn car park it is reasonably busy and there is a 10% discount on coffee and snacks in the Holiday Inn Coffee Shop.
Winchester, now open, could become a rival.
Fleet Services, northbound, is old, only 150kw and often busy. The new V3 superchargers are still hooded, as are all the southbound ones. The reason, it is believed, is down to a dispute between the landlord/property owner over the price of a wayleave to allow the power supply company to install new cables. This is both childish and anti-social, but as demand for EV points increases is likely to become more common. Legislation is needed to stop this sort of nonsense (rant over).