Actually, I think if you try to map the player types from the Revisited article onto GNS, then Timmy is the simulationist and Spike is the gamist...at least in terms of motivation. Sim or Right to Dream is about getting the right experience. Nar or Story Now is about expressing or saying something. Gam or Step on Up is about proving yourself.
But MtG is not an RPG, so there are obvious differences. The subtypes Rosewater lists don't really work in this context.
The thing about GNS is also that it doesn't really describe people as such. If you try to do that, it becomes a Rorschach test, a blank slate where you read yourself into something.
Personally, I'm motivated by all three (or four) types. It's not really which type of player you are it's about which motivations you prioritize during play, as a group.
That's a roundabout way of saying I picked all four.