IRS requires you to estimate your Required Annual Payment for the year 2025 and pay as you go.
So you have to do both.
Priority is keeping current on your installment payments for 2024.
missing or insufficient Estimated tax could result in an underpayment penalty on your 2025 tax return. That's manageable.
Your Estimated Tax payment goes onto your 2025 account
Your 2025 quarterly payments will go towards your 2025 tax return. When you are on an instalment plan with the IRS the interest keeps accruing, so paying that off is a big plus.
An instalment plan allows you to pay your taxes over time and avoids garnishments, levies or other collection actions. However, you'll still owe penalties and interest for paying your taxes late.