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There is a crack in a wall that I would like to fill with some removable insulation.

It must be removable, as such it should just be a temporary solution.

I know of rockwool and glasswool, but don't know which is best, or if there exist other types.

Which should I get and stump the crack with?

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What sort of wall (material, interior/exterior)? Why are you trying to stuff it with insulation instead of repairing the crack? How big is the crack? Are you trying to insulate for heat, sound or visual? A picture of the crack may help –  gregmac Oct 22 '11 at 19:07
Additionally, what caused the crack? How long is "temporary"? –  Hemm Oct 24 '11 at 0:01
there really isn't a best insulation for crack repair. –  DA01 Oct 24 '11 at 1:25
Blown-in insulation is technically removable if you have a shopvac! :) –  Doresoom Nov 2 '11 at 19:44
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up vote 3 down vote accepted

You can use Backer Rod to fill in the crack if it is not too wide. Backer rod is an easy to compress rope-like celled foam and should be easy to remove at a later date. It is mainly used to fill deep cracks before caulking to give support to the caulk.

Backer rod comes in a variety of diameters and should be able to be found at your local building supply store.

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