To Buy More Or Payoff What You Have And Retire?

[Justin S.]

I am starting to accumulate enough units where if they are all paid off I could "retire" and be more than comfortable. 

I would love to hear some stories of one the following:

1. Their strategy to keep accumulating enough units to retire on cash flow even with mortgages

2. Once you have accumulated enough units, rapidly pay them off to retire mortgage free.

I struggle with which approach works better/faster and what approach certain people took and how they achieved it.

I look forward to the responses