Since of course wubi is only one of the clients that would be using metalinks we shouldn't narrow down the metalink scope because of wubi. Nevertheless I think that the same requirements would be shared by other downloaders. In fact, if metalink are supported, it is a fairly safe guess that the download manager can resume a download and swap mirrors. Hence bandwidth is more important than uptime and reliability. So I'd guess that speed is the main criteria for choosing the "preference" as far as clients go. Of course you might adjust that for load balancing considerations.
Since of course wubi is only one of the clients that would be using metalinks we shouldn't narrow down the metalink scope because of wubi. Nevertheless I think that the same requirements would be shared by other downloaders. In fact, if metalink are supported, it is a fairly safe guess that the download manager can resume a download and swap mirrors. Hence bandwidth is more important than uptime and reliability. So I'd guess that speed is the main criteria for choosing the "preference" as far as clients go. Of course you might adjust that for load balancing considerations.