There is no simple answer to this question as it depends on a variety of factors including your skillset, experience, and preferences. That said, both product marketing and project management can be excellent career choices with plenty of opportunities for growth.
If you enjoy working with teams, coordinating projects, and generally being in control of the big picture, then project management may be a good fit for you. On the other hand, if you prefer working on individual campaigns, analyzing data, and coming up with creative solutions to problems, then product marketing could be a better choice.
The best way to figure out which option is right for you is to learn as much as you can about both fields. Talk to people who work in each area, read articles and books, and look for opportunities to gain experience in both product marketing and project management. Once you have a better understanding of what each entails, you'll be in a better position to make a decision about which path to pursue.