They only way to properly answer this question is run the numbers. Run different scenarios, use the information you have and then make it worse case. Which ever scenario keeps the most money in your pocket and the best ROI is the route to take. If none work, then you might need to explore other means of funding. Rates are hight right now and if your primary residents has a great rate the HELOC normally is the smarter play as long as your have repayment plan that allows you to risen and repeat. Good luck!