IMHO neither 16/2 or 18/4 will work for the shades or drapes.
There are too many different options for control, 120v (4 wire), RS232 (Cat5), RS485 (Cat5), low voltage relays (Cat5), RF (no control wires), IR (no control wires), and Lutron (propriety wiring). For all above (except 120v control...