Demolition hammers are designed to demolish concrete & brickwork, not drill into it and so do not rotate. They are lighter to enable horizontal work (see breakers for more powerful upright work or hammers for drilling).
The key consideration when choosing a demolition hammer is the shank size of the chisel or point bit. SDS max size is the latest technology but, in terms of shank size, is the entry level for demolition hammers. The A/F shank size bits are larger for heavier duty work. A/F refers to "across flats" ie. the width across the hexagonal shank.