Cash out refinance or heloc?

[Matthew Franklin]

Looking to purchase my first duplex. I want to do HELOC with my house to purchase the rental. Then refinance in a year to pay the loan off. My mortgage company and my mortgage broker said it would be better to do a cash out refinance. Is anyone familiar with this? Would it still work to refinance down the road and be able to purchase another property? Either way I'm trying to purchase as many properties as possible, just not sure what the right decision is. Any input helps thanks.