The main difference between spreader and non-spreader hammocks lies in their design. Spreader hammocks feature a bar at each end that keeps the hammock flat and taut, making it easy to get in and out of. However, they can be a bit unstable and prone to flipping if not balanced correctly. Non-spreader hammocks, on the other hand, do not have these bars, so they form a natural curve when hung. They are more stable and often considered more comfortable, as they conform better to your body shape, but they might be a bit harder to enter and exit. It's a matter of personal preference, so you might want to try both types before making a decision.