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For the purpose of staying back and holding na objective while the remaining army moves forward, witch of this two is ideal?

Intercessors will take this one handily. They're much less of a priority target, very similar cost, more wounds and can contribute from range with their stalkers. (Oh and obsec)

I like Eliminators. They seem pretty good for their points. But you asked about camping objectives. For that wounds and ObSec are going to give a strong lead to the Intercessors.

If your question was “I’ve got some spare points, and have all my bases covered, looking for something to stick in the backfield” the poll would be a lot more even.