Ask HN: Which programming language should I choose?

I'm thinking of writing an open-source library for investing / trading purposes. I already have some code scattered around my projects but it would be better to extract common stuff to a lib. Being more or less proficient in Java and Rust I consider these two languages equally. So I wanted to "measure" what would be a better fit and I came up with the following table:

https://ibb.co/cL3GJT9

So 'Metric' is what I'm looking at when deciding. 'Weight' is my (a bit subjective) importance for the metric. 'Value' is how good language X is for this metric, and 'Score' is the metric multiplied by the value. Some metrics are positive, some are negative, but I made 'Value' to be 'more is better' for all of them. My metrics: performance - It hurts to say, but I've tested some very first task that I would like to do and Java turns out to be almost 50% quicker. fun - It's about my feeling when working in this language. popularity - I will care about adoption rate and pull requests from other developers. syntax - This one is more about expressiveness and being less error-prone. testing - It seems to me that Java is more mature here, for example, mutation testing is a lot better than in Rust. competition - I guess it's the reverse of popularity. I haven't found anything like this in Rust's world, but similar stuff exists in Java.

My question is: What did I miss? What do you think? The values above are a bit subjective and I can tweak them to show that Java's better for this. I'm asking here to get more objective input. Thanks.