which is better?

[ciampolo]

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Hello, I am somewhat new to the P2P world. I am using the windows xp on a dell 4700c. I use limewire and it works ok much of the time. My question is, which download is better? Specifically, for instance, I want to download a particular mp3. The same mp3 is listed a number of times at different sizes and bitrates.
I might download one mp3 at a size of 7406Kb a bitrate of 128 and a speed of Cable/dsl. Once downloaded, this seems to play fine. But the next download on the page is the same mp3 but at a size of 8423kb a bitrate of 160 and a speed of t1 or higher. this seems to play equally as well as the first.
I have noticed that file size and duration are directly proportional,ie a typical 4 minute mp3 single might be 7500kb while a 40 minute album would be more like 75000kb. Other than that obvious difference however, I must ask, 'which is better?' I know the smallest filesize possible is desirable.

thank you