There’s no functional difference, we just use both terms. It’s a bit arbitrary, but generally once a mall is a mall we stick with that and vice versa. E.g. “Westfield St Lukes” is known as “St Lukes mall” colloquially by pretty much everyone.

Kiwi here. We have malls and shopping centers, but only mall Santas

It either happens, or it doesn’t, or the chances are not equal.

That’s 50/50/50 or 1 in 3.