All merged.
Note that upload age should never server as a decision factor unless the files are otherwise identical (which was not the case for crazytrain for example, there were some differences in pattern data). Information inserted by people other than the original author (e.g. "this file passed through xxxxxx BBS" or "ripped by xxxxxxx") is always a reason to not prefer that file, because it shows that it's not the original file, even if that means that a file not containing any author information at all would be kept. (though it seems like I was distracted and did keep the chopper 1 version with the rip notice inside... oh well.)
Also note that unless you have specific knowledge which file is certain to be the original, you don't need to specifiy which file to keep. If it's just a random guess which file to keep, it would be more helpful not to make that guess at all.
