Egg whites whipped cream can not be eaten directly. First of all, the egg whipped cream is still raw, and secondly, egg white whipped "cream", is not really cream, egg white and cream are two different ingredients, accurately should be called meringue. Cream is a high fat content of dairy products, egg whites can not be made into a cream, only the appearance of some similar to the cream only.
In short, the whipped meringue is still raw, is the need to heat to become cooked before eating, while the cream whipped, can be eaten directly, and can not be baked, and even the cake can not be too hot, otherwise the cream will melt.