Use properties to pay down mortguage or refinace 30 year?

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Hello

I just joined and was wondering how everyone does this. Im 24 and currently I have 3 properties and hoping to buy 2 more this year.

Is it better to take all your profit to pay down the mortgage on 1 property and pay it off fast as possible and roll the profits into the other ones or just do a 30 year refinance and borrow it long as possible since its all about cash flow.

To my thinking its best to borrow it long as possible b/c of the tax write off and also its a lower monthly payment which means more money in your pocket. Just want to see everyone option