Now, i have to admit i Cinta both series! I'd say harry potter is unisex and appropriate for all ages, whilst twilight adresses mainly to teenage girls. HP talks about friendship and love, while twilight is lebih romantic! Also, hp gives lessons of life, although maybe in some cases, i would prefer Membaca twilight.
Finally, They are both written sejak two very talented and imaginative writers, j.k rowling and stephenie meyer. They wrote these buku to give teens (and not only) inspiration and time of happiness. So, if anda don't like one of these two series, don't blame them! We can't all have the same tastes!