SENTRY vs PHINOEX
SENTRY :
The Sentry's abilities derive from an experimental serum that creates a phase-shift in his molecules, causing each atom to step an instant ahead of the current time line. The serum induces a photosynthetic reaction, resulting in a hyper state of consciousness. The Sentry's powers are derived from a serum which causes his molecules to step an instant ahead of the current time line. Though most of his powers and their limits are still unknown, examples he has demonstrated so far are super-strength, super-speed, invulnerability, and flight. He can also project energy fields, control light, and has vast psychic and mental forces mainly used for holding his physical powers together, though it is not yet known whether the Sentry can use them the way Professor X and other psychics use theirs; the only psychic abilities he had displayed so far is implanting his memories inside Paul Jenkins' mind and calming the fury of the Hulk. It may be theorized that the Sentry also has the ability to produce hard-light constructs similar to those of Dazzler's when it was revealed that the Void is a just an expression of his repressed persona, and thus his creation. With the people dubbing The Sentry as the world's most powerful superhero, and with the serum causing a photosynthetic reaction to his body, completely altering his state of consciousness, it is nonetheless conceivable that Sentry's powers are limitless, and may even rival those of the Silver Surfer's and Phoenix's. He has very similar powers to Gladiator and Hyperion. In effect, the Sentry's powers are seemingly limitless
PHIONEX
Jean Grey possessed telepathic powers enabling her to read minds, project her thoughts into the minds of others, initiate astral travel, and mentally stun opponents with pure psionic force, among other talents. She also possessed telekinesis, allowing her to levitate and manipulate objects and others, generate force fields, fly, and stimulate heat molecules to generate concussive blasts.
HER powers were magnified to near-infinite levels while she served as an avatar for the cosmic Phoenix Force. She was able to manipulate matter and energy on a molecular scale, although this varied on the Force's status and how much power it chose to allocate to her.
SO WHO WOULD WIN