What makes you think you have a choice? That's like asking whether binary heaps should be more ambitious or more polite.

Most of what you're describing is either faked by something outside the LLM, or if invented later will involve some completely new approach that will have a different name.

If you're thinking of prompts like "be friendly", that's not imbuing a behavior into the LLM itself, but rather adding a prefix to the document in the hopes it will have a desirable effect on what gets appended.