Hello, I need advice for bookkeeping 6 buildings, if I should go with Xero or Quickbooks Online. I don't have much experience with accounting. Thank you for the advice.

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If you are planning to use the help of an accountant, ask for recommendation from him/her as he/she will most likely recommend something that he/she is familiar with and should be able to help you on the setup and guide you on the process. Both will work however, that also depends on your accountant's familiarity with the software.

I am a QBO Pro advisor so I always use and recommend QBO, of course, I am biased. 

@Alex Barb So the question for you is:

- How many EIN's do you have?

Just keep in mind, that each EIN should have a separate QBO subscription.