When you present by yourself you do not have to consider any other co-facilitator needs and requirements. However, facilitating together with somebody else may also have certain benefits. Some think that it will safe in preparation time, but you may find that this is actually not the case. You may not need to prepare the materials /topics covered by your co-facilitator, but you do need to spend the time on agreeing who is doing precisely what and come up with good transitions between the two presentations.
Interweaving the two parts presented by each person can create an interesting and dynamic mix. This is a clear case of one plus one equals more than two. The book Public Speaking Excellence includes a lot of tips for how best to present together with somebody else.