I like Storm, but her abilities (not powers) are ridiculous, her high "will power", I can assure you was only developed because she was a popular character. Technically, Im sure anyone who isnt in denial would know that she would easily be shut down by most skilled telepaths.
Thats what I dislike about comics, even Jeans powers are over-exaggerated, but in Phoenix mode, Storm is deader than dead, period. And a fight between regular Jean and Storm would be a 50/50, you win some you loose some.
I saw someone mention the most recent fight between Emma and Storm, which was written terribly (actually,the whole series). Emma could definitely stand a better chance against Storm, Far more than non-Phoenix Jean. Not only does her telepathy rival Jean and Charles, (personally Ive seen Emma do more with her powers) but she had her diamond form this time around, plus shes smarter than Storm.
Storm would have had a harder time holding Emma back, apparently Emma can lift up to 50 tons while in diamond form and she survived a frikken building collapsing on her. Plus, Storm wouldnt know where exactly to hit Emma for her to shatter, and Im sure Emma could just move her face out of the way (her weak spot).
All Emma would have to do is resist Storms attacks, get her tired, knock her down and then turn back to normal to finish her off, done deal, that fight is bullet proof, I think writers just like Storm more, than to have her defeated at the hands of Emma, which I think is more logical.