That rate is kind of high. That would make me want to pay it off, but I guess it depends on your tax situation.
We used our HELOC for some home improvements a few years ago, rather than drain our taxable account to pay for them. We don't normally have any debt. One thing I found was that I treated that HELOC like a hair on fire emergency. Every purchase was scrutinized and I was on top of meal planning. I don't approach extra saving that way that's for sure.
I think we were actually better off paying off our debt over time because we were focused on paying that off asap, rather than going out to eat, traveling, etc. At the same time our taxable investments did well. The interest rates were much lower then, so the math made more sense.