Hi Vinod,

Let's carry out some quick comparisons,,

• NIRF ranking of IIT Mandi is 31 while the ranking of IIIT Lucknow is not known.
• B.Tech Engineering Physics course fee at IIT Mandi is INR 8.29 Lakhs and B.Tech Information Technology course fee at IIIT Lucknow is INR 8.93 Lakhs.
• B.Tech average package at IIT Mandi is INR 10 Lakhs, while for IIIT Lucknow is not known.
• Facilities are less at IIIT Lucknow like they don't have gym, cafeteria and Wifi facility is note there at IIT Mandi.
• Cutoff for engineering physics  course at IIT Mandi is AIR 14137 in JEE Advanced while for B.Tech IT is AIR 543 through JEE Main.

If you are getting both of them then IIT Mandi will be definitely a good option.

Refer here for IIT Mandi - https://www.careers360.com/university/indian-institute-of-technology-mandi/btech-engineering-physics-course

Refer here for IIIT Lucknow - https://www.careers360.com/university/indian-institute-of-information-technology-lucknow/btech-information-technology-course

To know your other best admission possibilities of Institutes & branches in JOSSA & State counseling as per your percentile, You can use JEE Main College Predictor tool given below

https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

Feel free to ask doubts in the Comment Section.

I hope this information helps you.

Good Luck!