I'd give it to Darkseid if only because they could give Juggernaut full power making him do some awesome stuff while backing up X-Man...
But then next month, they'd make Juggernaut a pitiful shadow of himself (yet again) and he'd get stomped by Thing or someone, at which point Darkseid would needlessly develop an inferiority complex.
Otherwise if they'd get Juggernaut off this power rollercoaster then I'm sure he and X-Man could make an awesome power combo.