Pre-nathema Vitiate had just over a century to mature his power and study from a rather large wealth of knowledge. Given that he could already make his Sith father - someone powerful enough to rule a 'sith world'- blind to Force in confrontation as a ten year old, I think the victor is clear. Say it with me - Bane dies
Well, at age 10 he an schlaughtered a Sith Lord by severing him from the force and destroying his mind, and at age 13 he was anointed a Sith Lord. Pre Nathema proceeded to study the dark side in seclusion for about a century, and he became such an adroit sorcerer that he was able to successfully pull off the most complex Sith ritual ever attempted.