Which is suitable the same custom-domein or each custom-domein for in creating multiple apps

As I wrote above title, it would be appreciated if you could let me know.

The thing is that, which is suitable the same custom-domein with one tenant or each custom-domein with multiple talent in the case of creating multiple apps for login page.

Let’s say you create 2 apps and you want to create login page.

you can choose

  • login.app1_name.company_name.com
  • login.app2_name.company_name.com
    by using each custom-domein with multiple talent

OR

  • login.company_name.com
    by using the same custom-domein with one tenant .

If possible, I want to use each custom-domein with one tenant. But I can’t, which is the best?