Thank you for reaching out to us! This is an excellent question. The main differences are in materials, side and headboard height, assembly, and price. For the materials, this bed is offered in maple and walnut, whereas the Sosta is only offered in red oak. The sideboards and headboards are 19" and 22" for the Gentle Bed, whereas they are 16" and 14" on the Sosta Bed, which enables you to use thicker mattresses while still having the security of the sides being high enough to help prevent children rolling out of bed. In terms of assembly, the Gentle Bed uses fewer screws, but does require more assembly overall. This helps us use smaller and fewer packages to ship you the bed, and greatly reduces the price in comparison to the Sosta Bed. I hope this helps, but if you have any other questions, please email our support team at support@sprout-kids.com!