It all boils down to what do you know in terms of languages and how good a quality of libraries you can find.
IBKR is kind of an elitistic VIP club, not just anyone can gain access. Thus you won't find a lot of libraries. There's a good number of them but the quality is not great.
I always wanted to learn OCaml by the way but in my current life and career phase I still can't justify the time and energy expenditure, and I know it will be significant.
