I'm a fan of Supermaven, and speed does make a difference. In our team, most of the devs switched to Supermaven after seeing how quickly and concisely it works. I used to work with Cursor, but after trying Supermaven, which has the largest context among any Copilots, I found it instantly reads the context of my project and suggests code in my project's style.
From what I've found on their blog (https://www.cursor.com/blog/problems-2023), Cursor's context is 500k tokens, which is much better than GitHub Copilot's 8k tokens, but still not a competitor for Supermaven's 1m tokens. So in the end, Supermaven learns from your project. The more you write, the more it actually matches your code style.