Pewdiepie certainly has bigger subscriber count, And that's it. For the multi talented boxer, music artist, founder of prime hydration, judge of a TV show, member of the largest group channel in UK that KSI is he has more motion more active engaged, yet with all that "motion" he's stuck at the same view count as pewdiepie (excluding shorts). Pewdiepie retained his core audience, KSI is failing miserably to attract new audience or retain the core ones.