What are the main advantages/disadvantages of both? DS is 5 months so preparing for weaning. We've been given an old Antilop but it only has a waist strap, not a harness so not sure if it's safe? Just want something comfy and easy to clean, doesn't matter if it doesn't fold as could sit at the table in place of a normal chair. Ideally not massive or expensive ( under £50 preferably ) Any recommendations?