Depends.
Cold storages makes the amylose retrograde, but in store bought bread there are several tricks to circumvent/prevent this. Retrogradation makes the bread "go dry".
On the other hand, cold storage is more favourable in terms of microbial aspects.
I'd say room temp for homemade bread for a good compromise between sensory and microbial quality.
Besonders authentisches Detail: Die roten Äderchen in den Augen vom zerstörten Schlafrhythmus.