I need to point out though, that packages are awesome as someone who used RedHat and fedora for a while. I also used Gentoo back in the day. .deb packages are awesome.
I am also surprised that you will hear differences between different linux distros. They all use the same code and packages. Hell, even the drivers are the same. You can easily hear a difference between Windows and Linux but I am skeptical that you hear actual differences between Ubuntu and Debian since Ubuntu is really a set of debian packages. I have heard of linux mint. They say straight up that it is an ubuntu clone with some package modifications. These modifications use common code and Linux Mint seems to bundle more A/V codecs. Almost certainly they use exactly the same audio drivers. There are only a few ways to play audio in Linux. OSS4, which is currently outdated and most likely shouldn't be used, ALSA, and if you want to hurt yourself, PluseAudio. The only difference I could see is the default setup of the audio and perhaps a few equalizer settings.
ALSA is fantastic. I am guessing that mess of people who worked on OSS4 moved to ALSA. The drivers are generally very good and it has wide support. Again though, once an ALSA driver is written, it is shared among all distros. It isn't like you pick up Linux Mint and get a totally different driver.
In my opinion, stick to Ubuntu. It is a great OS and quite stable. You can also do just about anything you want to do with it. Hell, you can uninstall every package and compile each from scratch if you wanted to. I don't know why you would want to, but you can.