OSS - Open Sound System, it is a little bit older and dated technology (oher crrect me if i am wrong) it has been depricated in the 2.6 series kernel
ALSA - The replacement to OSS, it is newer has better support and is the future of linux sound systems.
I would recommend using alsa over oss. although you can use whichever you perfer or if you soundcard is not supported under ALSA or vice versa.
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