I had a big argument with a guy from the Gamer Husbands a while back about the whole downloads on PS3 vs 360 thing. It got to the point where I started capturing patch downloads on video on my phone and I think I uploaded a few on my YouTube channel.
But it still does seem to be a case by case basis which I would imagine would mean it's a personal internet issue. I know years ago there wasn't any argument because the Xbox blew the PS3 out of the water. I know that you could increase uyour PS3 speeds by opening up ports on your router and other shit that I tried messing with and it just made things worse. But as of the past year, maybe two years, that hasn't been the case.
Also, keep in mind that I have a podunk internet service that gets me a 10mb connection and I'm running my consoles wirelessly. Take that for what it's worth.
I would also like to add that I didn't have any isses with my old 60GB or my current slim PS3, but my wife's old 40GB does seem to download shit much, much slower than mine. Her console is also right next to the router in the next room so I don't know what the deal is there.