Who is Best - T-Series or PewDiePie ?
PewDiePie vs T-Series is an online competition between two YouTube channels, PewDiePie (run by Felix Kjellberg) and Indian record company T-Series, for the title of the most-subscribed channel on the video-sharing website. T-Series has held the title of most-viewed channel since early 2017. Though PewDiePie had led in subscriber count since 2013. T-Series has overtaken PewDiePie most of time in 2019.

Who is Best ?

Felix Kjellberg, known online as PewDiePie, is a Swedish YouTuber who makes comedy videos and has previously made Let's Play videos. His channel had the most subscribers from 2013 to February 2019, at which point he was temporarily surpassed for the first time by T-Series. This occurred multiple times over the following weeks. He has over 91 million subscribers and 20.7 billion views as of 20 March 2019. He refers to his fanbase as the "9-year-old army".

T-Series is an Indian music record label and film production company. On YouTube, it has a multi-channel network consisting of 29 channels, run by a team of 13 people, with over 100 million combined subscribers in total as of November 2018. The main T-Series channel primarily contains Indian music videos (Bollywood music and Indi-pop) as well as Bollywood film trailers, and uploads several videos every day. T-Series became the most-viewed channel on YouTube in February 2017, having over 64 billion views as of 21 March 2019. T-Series became the most-subscribed channel on YouTube, as of 26 March 2019, has over 91+ million subscribers.

YouTubers such as MrBeast, Markiplier, Jacksepticeye and Logan Paul have voiced their support for PewDiePie, and many of PewDiePie's fans have made efforts to gain subscribers for his channel. Other YouTubers such as CarryMinati, Jus Reign & Bollywood Celebrities have voiced their support for T-Series. The competition has extended beyond the online race itself; thousands of vulnerable printers, cameras, windows machines, streaming dongles and smart TVs were hacked to promote PewDiePie and point out security vulnerabilities in late 2018 and early 2019.