You can get either, assuming you have the income to qualify. Which one to use depends on what you want to use the borrowed funds for.
Use a mortgage term if:
you know exactly how much you want to borrow all at once
want access to the lowest interest rates
are okay with paying back both principal and interest each month
need to borrow more than 65% and up to 80% of your home value
Use a HELOC if:
you only want to withdraw funds slowly as you need them, or are unsure of how much you need all at once
want the ability to pay interest only (no principal) each month
prefer to be able to pay off the HELOC at any time, without penalty
only need to borrow up to 65% of your home value
Essentially a HELOC is more flexible than a mortgage, but comes with a higher interest rate, as well as a limit of 65% LTV available to borrow. Most banks also allow you to convert large HELOC balances into term portions, so you aren't necessarily stuck with a HELOC only if you go that route.