Will mold grow faster on white bread rye bread or wheat bread?

Mold will grow quicker on white bread than it will grow on rye or plain brown wheat bread.

It also depends on the formulation of the bread, whether or not it contains artificial or natural preservatives, the quality of the ingredients - and their original state of freshness - and then, of course, the conditions under which the bread was produced and the conditions in which it is being stored.