A simple comparison:
Quan Zhi is a domestic chip, and there are no licenses in many aspects. It seems that I only bought A8 kernel, but Rising Micro and Chen Jing are relatively complete in this respect. Chen Jing was also the first person to buy CORTEX-A9 kernel. If we take the domestic property right system, we will have some advantages, while we will take Chen Jing and Rising micro will abroad.
At present, the price of the overall plan A 10 is equivalent to that of Chen Jing M3, and the marketing strategy is mainly to seize the market of Rising Micro, but Rising Micro has also adjusted its price and moved closer to A 10 and M3. The cost of Quan Zhi A 13 and Chen Jing M3L is lower, and the price of RK29 18 is far less than the former two.
A 13 and Crystal Morning M3L are both CPU, omitting HDMI and LVDS. It is understood that the package of A 13 is different from A 10, and the package of M3 and M3L in Chen Jing is the same, which means that the existing board can directly replace the CPU.
Others can only be experienced by consumers themselves. Each company has different strengths, and there are also differences in the optimization of product software and hardware.
So I can't analyze it in detail here. I hope these can help you.