>>6023504
webm for lazys is a really good gui, especially if you want to crop or clip visually.
I'm the author of webm-for-4chan so I'm biased, but I'll stack it up against any converter. They're both ffmpeg wrappers that allow you to manually specify settings so you can get similar if not identical results if you wanted to. But I've done a fair amount of research into choosing the right settings and enabling small optimizations.
I think if you know nothing about making webms, webm-for-4chan picks good enough defaults (probably better than you can pick if you don't know what you're doing), and if you have experience you can tweak the settings to get better results.

If you'd like to know more about the theory, I have a write-up:
https://chameleon-ai.github.io/webm-guide/