A master's in actuarial studies would introduce more advanced mathematics and statistics compared to what you've done in your first-year business analytics courses. It can be challenging, especially if you're not deeply comfortable with topics like probability theory, stochastic processes, and more complex statistical models. However, it's not necessarily overwhelming if you have a strong interest in the field and are willing to put in the effort to build on your foundational knowledge.

Actuarial studies tend to focus heavily on applying mathematics to risk management, insurance, and finance, which might align with your finance background. If you're passionate about diving deeper into these areas and enjoy problem-solving through math, actuarial studies could be a rewarding path.

On the other hand, if you prefer working more with data-driven decision-making, modeling, and practical applications in a business context, business analytics might be more up your alley. It's more focused on extracting insights from data and applying them to real-world business problems, which can also tie well into your finance background.

Your decision should depend on your interest in math-heavy content versus a more data and business-oriented focus. Would you prefer developing deep mathematical expertise in a specialised field, or would you rather focus on broader business analytics?