@Jesse Chambers It depends on your goals. How much is enough cash flow for you and your family to live the life you want to live? You have to begin with the end in mind and work from there. If you haven’t mapped out a plan, do so. That should help you decide which property is better to tap. Also use BiggerPockets for help with all questions you have. There are agents, lawyers, CPA’s and battle tested investors of all styles here. The knowledge that the members here possess cannot be understated.
In regards to the HELOC vs refi, the HELOC is going to be much less expensive than a refi. Thousands less. You also mentioned hoarding cash for a downturn. Tapping the equity now while the market is going up or at its peak is a wise play in my opinion. You have enough equity that you can buy property in a lot of markets for cash. That is a good thing. It gives you massive bargaining power (I was getting killed by cash buyers when I first started out) and it allows you to take out another HELOC on the property purchased and pay the original HELOC back. Buying this way also eliminates seasoning issues you may bump into also. With some refi's lenders want you to have owned the property for 6-12 months before they will lend to you which can slow your growth (forgive me if I'm stating things you already know). If you have purchased correctly, which you clearly have based on your current holdings, you will have 20-30% equity in a cash flowing, appreciating asset and have cash you can tap over and over again. Again, depends on your style and what your goals are.
BOTH ways work just fine based on your equity position.
I’m truly excited for you and feel free to PM me