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I assume you mean video quality.
Containers can have a bunch of different encoded streams in them, some even multiple at once.
It's the quality of the stream that matters, but of course some containers use streams that are optimized for quality first and low file size second.
I think what you mean is, if you work a video step-by-step, you wanna look at mov files in ProRes 4444. They can be extremely big but usually they carry enough quality that even if you do heavy processing in a few steps the material doesn't degrade as much. In fact, most cameras can even record in that format.
For the output for YouTube, people usually just revert to mp4 with H264 streams (sometimes H265 but still less common) and then you can look at export settings for you specific platform. E.g. for 4k60fps videos YouTube recommends Stereo 48kHz audio streams and progressive scan, chroma subsampling at 4:2:0, variable Bitrate around 240Mbps and color space BT.709.
What I'm saying is, quality and file size vary widely between file containers as well as stream encodings, and if you're working with video you should just look up online what's best for your process, what your recording device recommends for your use case and what settings your platform recommends for publishing. And then you move from one recommendation to the other when you're done with each.