Opinions differ on whether one should use OOP or functional programming and when. Here are some things you may want to consider when deciding which might be more suitable for your project.

1. Many programming languages favor one paradigm over the other. Java, for example, strongly favors an object oriented style. If you already have a certain language or library you plan on using, it may be best to use the paradigm which is most idiomatic in that language.
2. Object oriented programming is more popular. If you plan on working with other people, it may be easier to find people to work with if your project uses an object oriented style.
3. Functional programs deal with immutable data, which makes it easier to write parallelized code. Parallelized code can make a big difference in runtime depending on the program and hardware it's running on.
4. It's easier to write tests and debug code in functional programs. The output of a function depends only on its input, not some internal persistent state, so there's much less to think about when ensuring that it behaves correctly. Programmers spend more time writing tests and debugging than writing the program itself, so this can be a big time saver.
5. It's also worth noting that some languages, such as Rust, are considered to be multi-paradigm and support both styles. If using one of these languages, you don't need to commit to one style or the other for the entire project but can instead switch between them as you deal with sub-problems that you think would be best addressed with one or the other.
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