As a dancer the dances are one of the main things I focus on so I have many: My absolute favorite is Getting Closer by Seventeen, that dance is a work of art! But also:
Pretty much every Seventeen choreography especially:
Don't Wanna Cry, Aju Nice, Home, Fallin' Flower, Thanks
Wannabe-Itzy
Also a lot of Twice songs:
Fancy, What is Love, Likey, Feel Special
Wonderland, Horizon, and Pirate Kind-Ateez
Chain, Simon Says, Firetruck, Cherry Bomb-NCT 127
Rocking-Teen Top
Overdose and Ko Ko Bop-EXO
Fire and Spring Day-BTS
Voodoo Doll-Vixx
Baby, Crazy Sexy Cool, Hide and Seek-ASTRO
Killing Me-iKON
Miroh and Double Knot-Stray Kids
Runaway-TXT
Crazy-4Minute
Beautiful and Energetic-Wanna One
Spaceship-IZ*ONE
I really like the Black on Black (NCT) choreography, especially the part where Jisung is in the front, and Ten's little solo dance. I also like Monster (EXO) choreography, especially the X formation part, Chanyeol jumping over three(?) of the members (I forgot who they are) during his rap part and the dance during the chorus after Chanyeol's rap. Also, Ryujin's shoulder dance in the beginning of Wannabe (Itzy) is iconic and I have tried (and failed) many times to do it. I feel like the dance during the chorus of Boombayah (Blackpink) would be really fun to do.