Quickbooks desktop transactions for rent, sub-customer or class?

[Kelly Byrd]

This isn't a question about which software to use, or how to setup Quickbooks. I'm committed to trying Quickbooks Pro Desktop for Windows to handle the books for a 12-unit property I just closed on. I have a specific question about entering transactions. I'm investing out of state and have a property manager that uses App Folio, so I'm not planning on using Quickbooks to actually generate invoices for rent. Most of the transactions will be mirroring my property account the PM, entering transactions, making sure things reconcile 

I have a 12-unit property and plan to have more in the same company file, so I have followed the advice here and other places and setup classes and sub-classes like this:
- 123 Retirement Blvd
-- Unit 1
-- Unit 2
...

I have also setup Customer, Job, Sub-Job with
- 123 Retirement Blvd
-- Unit 1
--- Jane Renter
-- Unit 2
--- John Tenant
...

So, now I'm going to enter rent from Jane Renter. When entering a transaction for my "PropMgmt Acct" I see that I can tag the transaction with a Customer:Job:SubJob and a Class:SubClass.  Should I be using both? One or the other? Why?