It would depend on whether it's for a group or for solos. When it comes to ballads Jonghyun was always my favorite. When it comes to groups I like Yongguks work the most, the songs he works on just tend to be really good and I tend to like the lyrics because they tend to be meaningful or at least fit the song really well instead of just some standard girl you're so pretty I love you please date me ohh laa laa.