2001 Pongal - Dheena VS Friends :
Both Dheena and Friends did a solid business at the box office. Dheena was a mass entertainer and gave a big break in Ajith's career, of course a hit director AR Murugadoss has been introduced with Dheena.
Friends is a family entertainer and it marked the hat-trick success for Vijay after Kushi and Priyamanavale.
2002 Diwali - Baghavathi vs Villain:
Vijay's Baghavathi did average business at the box office while Ajith's Villain was a super hit. The Diwali also seen another film Ramanna which was actually a blockbuster.
2003 Diwali - Thirumalai vs Anjaneya:
2003 Diwali marked the success for Vijay and Thirumalai was actually a comeback movie for the actor while Ajith's Anjaneya did average business.
2006 Pongal - Aadhi vs Paramasivan:
2006 Pongal has both Aadhi and Paramasivan. Paramasivan did okay business while Aadhi was a disaster.
2007 Pongal - Pokkiri vs Aalwar:
2007 Pongal has both Pokkiri and Aalwar, Vijay's Pokkiri was a blockbuster while Ajith's Aalwar was a disaster.
2016 Pongal - Veeram vs Jilla:
2016 Pongal has both Veeram and Jilla, Ajith Veeram was a blockbuster while Vijay's Jilla was also a blockbusterand both stands a superior level in collection and boxoffice also got a good collection after a long time both of their clashes got a good reviews since 2001
Source : Google