The RS400 is slightly more powerful.
The RS400 has a metal body
The RS400 has standard Bowens mount and can directly mount your octabox and other modifers
The RS400 has a modeling light
If size is not a problem, the RS400 would appear to be more suitable. However, I can find no US-based sellers of the RS400. That means if you receive a defective unit or experience a failure you will have to deal with the manufacturer in China, and pay for shipping to China for repair/replacement. This could leave you without a light for two months or more.
The AD360 is nearly as powerful
There are limited modifiers that attach directly to the AD360. However, you can use a Godox S-type bracket to attach Bowens-mount modifiers
The AD360 is more portable
The AD360 is available from Cheetahstand as the CL-360, a US-based company that provides warranty service in the USA
It is possible that neither of the above will be powerful enough to override direct sunlight in a large modifier such as a 55-inch octa. You may need to the included reflector or a medium beauty dish in direct sunlight.
Third option not discussed is the RS600, which is available from Cheetahstand as the CL-600. While more expensive it has all the benefits of the RS400, higher power output, and US-based service from Cheetahstand. My only concern would be, depending on the size of your studio, it might actually be too powerful.
Edit: I see Jim mentioned the RS600. Also, it's hard to make product limitations based on your geography if you don't list your location in your profile.