Both versions of StudioDock provide the same great features and support. The only difference is in the magnetic plate that you attach your iPad to. The 11” model (K34031WW) has a smaller plate designed specifically for USB-C based 11” iPad Pros (2018/2020/2021) and the new iPad Air (2020). The 12.9” model (K34030WW) has a slightly larger plate designed to perfectly fit USB-C based iPad Pro 12.9” (2018/2020/2021).