What is the difference between the Sirona S and the Sirona Z?

The two reboarders look very similar and also bring similar features. The main difference is the base to the child seats. The Sirona S has an integrated base and cannot be detached from it. This means that while you don't have to buy a separately available base to go with it, it is more impractical if you want to use the child seat in two cars alternately, as the child seat with base is a bit bulky. If this is not a problem for you, the Sirona S is a good solution for you. The Sirona Z, on the other hand, does not come with its own base. This must be purchased separately. However, it can also be used with the Cloud Z infant carrier, which can be useful for additional additions to the family.