There is currently no direct successor to Varjo Aero as it has been taken off the market. - UploadVR

Varjo Aero, a high-resolution VR headset targeted at consumers, is no longer being sold. The headset, which had a price tag of $1990 and later dropped to $990, featured impressive display quality and eye tracking. However, it had some drawbacks such as distortion and limited field of view. Despite its strengths, the headset failed to gain widespread adoption. Varjo has since launched a new headset series called XR-4, but it is currently only available for enterprise customers. For more details, please visit the source article on UploadVR.

Source: https://www.uploadvr.com/varjo-aero-is-off-the-market/