If u have no place for a baby's bed, what the best decision, moses basket or a baby stroller? Which one is safest?

Depends on design. Safety depends on the design of the product. For a new baby, a moses basket or a stroller that flattens out to be basket-like should be fine. The strollers that most people buy do not flatten out like a basket. There should be no openings in a basket or stroller where the baby could get stuck or trapped, if the baby will be using it as a bed.