In which circumstances are those? If your temporary contract ends within 26 weeks you'll be selected _before_ anyone with a fulltime contract. This will depend on the way that the company tries to fire someone.
https://www.uwv.nl/werkgevers/werkgever-en-ontslag/ik-wil-on...
It is much easier for companies to let temporary contracts expire than start the actual process to get permission to fire employees.
If you want to fire someone on a temporary contract, you will have to pay him off.
That's not "will" it is "might". You can wait until their contract ends. You can also fire the person if they severely misbehaved (stealing.. though not just 0.03 EUR like someone at Action who took a shopping bag :-p).
Note that "fire" is often used in case of involuntary dismissal, so saying that they need to be paid off is weird if you use "fire".
In particular circumstances, you have more security with a temporary contract.
Disclaimer : I am Dutch.