Booster seat ..which one?

Hi Nick, thank you for your inquiry. There is quite a few differences between the Britax Skyline and the Big AMP, the Britax Skyline does have a higher weight limit, it also has more head support & it has Isofix. We hope this helps.  For further information on this or any of our other products available, if you follow the link https://www.babyonthemove.co.nz/store-locations/ this will take you to our online store finder. Here you can find contact details for your nearest Baby On The Move Store where one of our team experts will be happy to assist you in your product search and help answer any further questions you may have. We hope this has helped with your query.