Revanth - I absolutely loved his performance of Bulleya in the theatre round with Santosh Hariharan (Santosh was amazing as well, pity he didn't make it to the top 14). And that's tied with Khamoshiyan for top spot.
Mohit- aj din chadheya, it was as good if not better than the original version.
Khudabaksh - chithiye - wasn't flawless but I love that song and I enjoyed it quite a bit.
Maalavika- though not flawless I enjoyed her singing kehna hi Kya tied with ainvayi ainvayi
Hardeep - the song e sang from the movie guru
Shravan - laga chunari mein daag
Rohit - his solo performance on the theatre round (forgetting the song)
Tajinder - his first performance in the audition round (I don't know the name of the song) and also dil haara
Manya - ti amo in the theatre round tied with ghani bawri
Mansi - the song she sang in the second elimination ( I'm forgetting a lot of names of songs)
Jeli - I think he sang all songs equally. There isn't a best.
Soumya - I enjoyed Tera allah nigehbaan though it wasn't the best renedition I've heard.
Stuti - the gala round song.
Some other mentions though they didn't make it to the top 14
Santosh Hariharan in bulleya was outstanding, infact there was a time I thought es be selected over Revanth. His audition oh soniyo was good too.
Rahul debs audition song