Multisite is tempting because of the shared users, theme, and plugin requirements, but with only two sites on different domains… it’s very easy to deploy a theme and plugins to two sites. So my gut: I’d probably just use two WP installs.
I’d also try to convince someone to really work through their IA and determine how different the content actually is between audiences, find a way to organize that, and then merge the sites. 🤓
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