Installed template. Core file overwrites appear to be identical. Switching between Westminster and Winchester is a quick.

My eyes like Westminster better than Winchester. Could be color scheme but blue is not a color that I normally gravitate to.
I like that login, cart & checkout are better defined with text and images by default.
I like currency change visible by default.
My eyes like fade-in over sliding homepage.

Did you change the way Custom Left Slideout works? Something seems different on the good side.

Problem on both the demo and my sandbox:

Tap or click CATEGORIES button without using the expanded menu.

Next screen is

HTML Code:
Not Found The requested URL /' . HTTP_SERVER . DIR_WS_CATALOG . ' was not found on this server.
 Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.