I believe sparks9 was talking about the iPhone not selling more than the iPod at this moment. And even if you look at the original iPod to the iPhone, you can't really compare the two. The first ipod was only compatible with the Mac (shutting off 90%+ of the market) and it was also creating a market which didn't really exist either.
Well, and I think ouimetnick, the original poster, meant it the way I see it. What else could "sell faster" mean?
Naaah, there had been quite a few MP3 players before. The iPod didn't create a market. It just made it extremely popular, and that took quite a while.
Windows availability came in mid 2003. Still, it took another 1.5 years before the thing became popular. You could also argue that the original US-only iPhone was shutting out 90%+ of the market. Don't forget you still can't buy it in a huge part of the world.
In my opinion, both devices are quite comparable. And the iPhone is much more successful, as the iPod had already paved the way. No one cared when the iPod was introduced, this was quite different with the iPhone.