I've had many wins with smaller dragons like Venid, Cybernid, and Syliru. If you feel like you're really good at the boss, you can move up to the more bigger dragons like Moix, Uhea, Eisen, and Lum, but you'll have a harder time dodging the attacks so if you don't feel comfortable with that, your best bet is to go for the Venid, Syliru, or Cybernid
