By experience, i mean the whole UX - which is as much the interface to the LLM as it is the LLM itself, imo. Ie i'm not terribly interested in constantly telling an LLM what i want, prodding it to do the right thing, etc. I'm more interested in ways it can be easy and correct - even if that's limited in functionality. Ie perhaps automatically suggesting docs, knowing what style to use, etc.
If you mean the model, I’ve been happy with Deepseek Coder. Mistral is a popular alternative as well.