Rentail investment property

[Michael Mathis]

Should I apply rental income against the investment property and then leverage/refinance, when the time comes, and use the money to put as a down payment on the next property or save the rental income in an account and leverage the property and use the saved cash? 

There really isn't a difference monetarily, just curious which way is better or possibly looks better to a bank. I figure they like seeing cash on hand, but if you apply income to mortgage -tax difference or change in taxes perhaps? 

Thoughts?