I have an .mkv file with both 5.1 and 2.0 audio tracks. I want to remove one of them to lower file size. Now, will 5.1 give a worse experience on standard 2 speakers setup than 2.0 track? Or is it better than 2.0 in every way?
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Hypothetically speaking, a mix optimized for 2.0 playback on 2 speakers should be slightly/somewhat better than a 5.1 mix automatically downmixed to those same 2 speakers. In practice, I doubt many consumers could tell the difference.
So, I recommend you drop the 2.0 and keep the 5.1 (assuming the program content is supposed to be the same).
Usually, if you have both 2.0 and 5.1 audio tracks the movie was originally stereo (maybe even mono) and the 5.1 track is some up-mix that's there to impress people who think bigger numbers are better.
I think that depends greatly on the source. Most original releases I've seen this way have actual intentionally different mix balances (both good). It's just someone's re-post who tries to up-mix, and usually (as you said) for the wrong reasons. Up-mixing rarely works well anyway.