"Ae Dil Hai Mushkil", directed by Karan Johar, and "Shivaay", which marks the second directorial venture of Ajay, will fight it out at the box office this Diwali, on October 28.
Heaping praise on the "Ae Dil Hai Mushkil" teaser, Rishi tweeted, "This is your tribute to Raj Kapoor & Yash Chopra films! Romance, music and intensity. @karanjohar (sic)."
"Another good trailer. Hindi Cinema extending its horizons. Congratulations! All kinds of films must survive!" he wrote.
While "Shivaay" centres around the adventures of a Lord Shiva devotee, "Ae Dil Hai Mushkil" is said to be an intense story about unrequited love. It also stars Aishwarya Rai Bachchan, Anushka Sharma and Fawad Khan.
Meanwhile, Rishi, who seems to be on a trailer-watching spree, also took to Twitter to praise megastar Amitabh Bachchan's upcoming thriller "Pink".
"Another interesting film coming. Rivetting! We are venturing into new content.Enough of the beaten track.Good signs!" the actor tweeted.