Portfolio Loans vs Secured Business Line of Credit

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For those with an LLC and free and clear properties what is the better short term loans to use for flips. The hot buzz word seems to be portfolio lenders but is seems to be a clunky process with a heavy pre-payment penalties The secured business line of credit seems to work like a consumer HELOC and to me would seem to be a better way to acquire funds.Flipping properties with short term loans of a year or less should be less expensive then portfolio or hard money loans

What are the pros or cons or these methods or what other types of short term loans would be good for flips ?