i feel they are both lighthearted school romances that makes you wish you could be in love. its not too heavy to were youre arguing with people about it, but its not too light to the point to where its boring.
they're both very heartwarming stories that i cried to. the difference is that while a-teen is more lighthearted, extraordinary you's storyline is a bit more delveloped and heavy. but that will just pull you in for more!