Which is better, x86 single board computer or ARM single board computer？

x86 SBCs are generally more powerful and better suited for tasks that require high-performance computing, such as running resource-intensive applications or processing large amounts of data. They also tend to be more compatible with desktop operating systems like Windows and Linux, making them a good choice for applications that require a familiar software environment.

Here is a cool Machine learning project based on Lattepanda 3 Delta 864. This may interest you.

https://www.pcbway.com/project/shareproject/IoT_AI_driven_Smart_Grocery_Cart_w_Edge_Impulse_5652a9b2.html