No Phoenix isn't fire, just surrounded by a huge fire bird or something.
But in a fight Stormy would definitely win. I mean in one issue Marvel wanted to do, Stormy single-handedly moved the Earth. And I mean that in ever sense of the word...or words. 😕
But Stormy would definitely kick @$$!! And like someone said [although I am using their words against them...sorry] Phoenix is crazed, therefore she ain't thinking to clearly.
These are her powers:
Known superhuman powers --- Phoenix II has the ability to exist in any environment without harm, project force bolts of incalculable power and create force fields. She also possesses the power of telepathy, illusion-casting; her link with the Phoenix force gives her vast psionic ability to manipulate time, space, matter, and energy for virtually any purpose.
Source of superhuman powers --- (innate telephathic abilities) Genetic mutation, (other psionic powers) Rachel Summers is a host for the Phoenix Force, a manifestation of a primal force of the universe which embodies the concepts of life and passion, especially the passion to create and destroy, and derives its power from the psyches of all living beings in the universe.
as you can see, she can manipulate matter therefore she can turn Storm into candy and eat her.