I know a guy who owns a ton (6 figures) of Apple stock. He LOVES his iPhone (and iPad). He tried the Galaxy S screen side-by-side with his iPhone, and he said the Galaxy S screen touch response is better. He was really impressed by the Galaxy S.
With the graphics capability of this series phones and the impending 2.2 update, we should see these new generation Android phones really kick some butt in the performance area which is sorely overdue IMO.