word of advise: if you want to make a serious comparison, maybe don't choose soundcloud to host it. don't you realize how much soundcloud degrades the quality of the recording? why talking details when you look at things through a filter which possibly even masks some of the broader strokes?
What site would you recommend? Most people don’t use uncompressed WAV files loaded to a site like Dropbox to manage and play their music. So in terms of conducting a test I think it is perfectly valid to post it to a site that represents real world usage. If you really wanted to make it a real world test, Youtube would actually have been better!