Hi,
I am wondering about your advice on the following installation:

Need to upgrade an existing 125A service to 200A and install new 200A load center in basement. There is an existing 125A loadcenter w/main that will be left in service.

I am proposing the following installation:

Install a new meter base on exterior wall of garage, immediately on the inside there will be a main breaker. From there I plan to install a SE Cable down to the basement to a gutter then refeed the existing 125A panel and the new 200A panel. Do I need a main in the 200A panel?

Or, should I feed the 200A panel from the main then refeed the 125A panel from the 200A panel?

Thanks for any ideas or comments.

Frodo