None of those will play on my car stereo. If you're going to use a substandard format there's zero sense in diverging from the format that's actually useable.
Every time I've accidentally downloaded acc's or whatever, I just promptly delete them. I'm not going to waste my time re:encoding a lossy format into another lossy format. And if I'm going to have a album that only plays on my PC, why wouldn't I just get flac?