Without a full breakdown on what hardware was in each machine (for example, same hard disks, same RAM speed/amounts, etc. in all machines?) it isn't worth much to me. Then there's the common sense approach of the whole matter - I wouldn't be using *any* of these machines to do transcoding, not when a $300 PC can do it much, much faster (and likely more elegantly).
FYI, I use both MOS and OS4.