For a BRRRR, which HELOC type is better: interest-only or P + I?

[Charles Moore]

Hey, all,

I'm pursuing a BRRRR strategy for a property using a HELOC from my primary residence. I will be refinancing it after the 6-month seasoning period. The credit union I chose offers both an interest-only HELOC and a principal + interest HELOC. Since I will pay off the HELOC in 6 months, which would be better to get a higher return?

Thanks!