One siloed website or three smaller?

I have an idea about an authority site that I want to build and work on as a long running project (indefinitely), but I'm torn between creating three sites targeting different audiences passing some relevant links between them or siloing a single larger site with relevant internal linking.

There are three distinct audiences for the different silos/sites. Two are for professionals (different professionals but the content is in the same niche) and one is for layman/"average joes".

I will be…

One siloed website or three smaller?