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Compare between RDTs and Thermistors.

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RTD
Thermistor
Made of metals like copper, platinum, nickel and tungsten.
Made of metallic oxides such as cobalt, manganese, nickel etc.
Have positive temperature coefficient of resistance that is their resistance increases as the temperature increases.
Thermistors of both positive and negative temperature coefficient of resistance are available but thermistors having NTC are used, that is, their resistance will decrease as the temperature increases.
Temperature range: -100 C to 650 C.
Temperature range: -50 C to 300 C
Temperature versus resistance characteristics are linear.
Temperature versus resistance characteristics are nonlinear.
Less sensitive to temperature than theristor
Thermistors are more sensitive to temperature in the specified range than RTDs
Cost is high
Less costlier than RTD
They have better reproducibility and low hysteresis. 
They have less reproducibility and more hysteresis.
Relatively bigger in size.
Thermistors are quite small in size and in shapes like washer, bead, probe, disc, etc.

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