Debt Pay Down vs. Save Cash Flow for more Property

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Hey Everyone,

I'm having an internal debate and would love some feedback on which strategy is better.

I own one duplex. 

Option 1: Do I take all of my excess cash flow (which I don't need) and pay down the debt as fast as possible - with the intention of refinancing, using the proceeds to purchase other income properties.

Option 2: Save all of my cash flow to combine with my other savings to fund another down payment and just do this as quickly as possible (while still keeping a reserve for disaster etc..) 

More than happy to answer follow-up questions but thank you for any insight, experience, or comments on comparing these strategies.

Jon