Analog switches when turned on will conduct whatever voltage is on the input to the output pin. When turned off, the output is usually disconnected and floats at whatever voltage the surrounding circuit provides.
Digital switches when on, duplicate the logic level on the input pin at the output pin. Only logic levels are carried through the switch. When turned off, the output will assume a default logic state.
Analog switches have a frequency response that gradually reduces the output as the frequency increases beyond a certain point.
Digital switches have a maximum rate at which the output state will follow the input state, to calculate it, you need to look at the rise and fall times of the output and the delay between control signal changing and output enabling.
Brian.