Switch sensor vs. switch PIC pin

[fratello]

I made one thermometer with LED display for my car. I intend to use two DS18B20 sensors. Which method it's better : 1.using a switch for sensor-and a single pin of 16F628A (picture 1); 2.switching between sensor from one port of PIC (figure 2).
The distance from PIC to switch are about 40 cm and from PIC to sensors are about meters. Thanks in advance for reply !