There is nothing like any default site. It is totally depend on you. You can choose which site template you want to use.
Please check below links for clarification on comm site vs team site and decide which one you want to use for your requirements.
Mostly it depends on your requirements. As hub sites will not be available in SP 2019, you may consider communication sites as a choice.
In the modern experience, Communication sites fulfill the same purpose as traditional publishing sites.
Moving from Publishing sites to Communication sites
What is a SharePoint communication site?