Now, i have to admit i upendo 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 zaidi romantic! Also, hp gives lessons of life, although maybe in some cases, i would prefer kusoma twilight.
Finally, They are both written kwa two very talented and imaginative writers, j.k rowling and stephenie meyer. They wrote these vitabu to give teens (and not only) inspiration and time of happiness. So, if wewe don't like one of these two series, don't blame them! We can't all have the same tastes!