Female Guardians of the Galaxy vs. Sisterhood of Evil Mutants
MOONDRAGON W/MG (please log in to view the image)
PHYLA-VELL (please log in to view the image)
GAMORA (please log in to view the image)
MANTIS (please log in to view the image)
VS.
MADELYNE PRYOR (please log in to view the image)
SPIRAL (please log in to view the image)
LADY DEATHSTRIKE (please log in to view the image)
PSYLOCKE (please log in to view the image)
It all comes down to Phyla, she has no feats as Martyr, but her Quasar incarnation should be above everyone else. If she's not considered herald level, then Spiral would outlast the Guardians.
Goblin Queen was no joke either. Remember during Inferno, both X-men and X-factor combined tried to break her shields and even then she was stuck in a psi-war with Jean. Goblin Queen and Spiral win it for T2 but it's close (Deathstrike and Psylocke are the weakest links).
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..even the outer hells are indifferent matters for they bow only to potent and archaic Nodens.
The only thing that would really keep the Sisterhood in the fight would be Deathstrike. IMO Being a cyborg she would be the only one that wouldn't get mind f*cked by Moondragon. Goblin Queen, Spiral, and Psylocke may be powerful, but they are not "resist an Infinity gem" powerful.