Park JinYoung and Yang HyunSuk are both no doubt successful CEO's in their own individual rights, having established the largest entertainment companies in the K-Pop scene.
What sets them apart from each other is their completely different personalities from each other, and different taste in music as well. If we listen to the artists of both JYP and YG Entertainment, it is pretty easy to tell which artists are part of which label. JYP Entertainment artists typically have a traditional K-Pop sound that is laced with R&B style vocals while most YG artists have a strong western pop-influenced sound.
It turns out the standards that JYP and YG have when selecting idols for their entertainment labels are very different as well. JYP Entertainment places heavy emphasis on an applicant's general vibe and personality. Park JinYoung has stated that it doesn't matter if someone can sing well, dance well, compose well. If that person doesn't have an approachable personality, he feels that it is not only difficult but pointless to try and work with someone like that. He believes that the process and the journey to success are more important than success itself. If someone is lacking a little bit of talent but has a great aura and vibe, he is inclined to usually help and work with that person. But the same can't be said for the opposite case.
YG Entertainment, on the other hand, seems to be an extreme opposite of JYP Entertainment. Not only their general sound with music but with artistic personalities as well. Yang HyunSuk himself has said that 'JYP may place an importance in good personality as one of the qualities he looks for when selecting an idol. I am not like that. I am the complete opposite. If I were to list qualities I look for when selecting idols in the order of their importance it would be talent, hard work, and good personality. I've worked in the music industry for twenty years and I know a star when I see one.' Basically, for YG, it doesn't really matter what kind of personality an idol has, as long as they are marketable, likable, and have qualities of a star.