Where better to pull the NTC thermistor? To earth or VCC?
The thermistor should pull to ground. My reasoning is that in the scenario where the thermistor is connected to DCVin and the thermistor is low resistance (imagine replacing with a short) if Vout were connected to a micro-controller there would be nothing limiting the current from DC Vin which could damage the input pins of the micro controller.

Having the thermistor pulling down to ground means that resistor R will always be limiting the current drawn from the power supply. Providing the microcontroller has the same ground reference as the thermistor then no damage would occur if the input pin was hard pulled down to ground