Reasons why Harry Potter is better than Twilight:
The ending is more realistic.
Harry Potter has a proper PLOT, and it has subplots.
The characters have depth.
JK is not afraid to sacrifice the good guys.
The characters aren't one dimensional.
The characters in Harry Potter actually grow as people as the series goes on. By the final book, Bella is STILL going on about how good-looking Edward is. (I'll give the twihards Jacob Black, because he is the only one that I am aware of that has actual character growth).
JK researches her material, has good use of Latin and history within her books. Spells are named after Latin words and do what the Latin words do.
Names of some characters give hints as to what that character is such as Sirius which means Dog Star and Albus which means White (pure wizard)
The female characters are strong and intelligent. Hermione doesn't NEED a boyfriend to be a strong good role model for girls everywhere.
The Harry Potter series has a broader fan base than angst ridden fifteen year olds.
Even Rob Pattison says he hates Edward Cullen and played him like a manic-depressive.
You like the characters in HP. Not because they are cool, or 'Hot', but because they have personality.
Stephan King (or any other distinguished author for that matter) has yet to tell JK Rowling that she "can't write". I believe he also said the following: That the Harry Potter series is about learning to do the right thing, no matter how difficult, while the Twilight series is about how important it is to have a boyfriend.
JK Rowling does not use the same comparison over and over and over and OVER again when describing a character.
You can see the characters in HP fall in love and watch as their feelings for each other grow. In Twilight Bella falls "unconditionally and irrevocably in love" with Edward in just a few weeks, without knowing anything at all about him, other than he's a hot vampire (that's like granite of course *rolls eyes*), and even after she found out he was stalking her and wanted to suck her blood. If two people really were to fell "in love" that fast they would probably fall out of love even faster.
Length of time spent writing. JK Rowling spent YEARS writing Harry Potter. Stephanie Meyer's spent MONTHS. The results? An original book, filled with interesting characters who, like real life, showed shades of grey, a good plot, interesting locations, a proper back story, proper parental figures, minor characters who serve a purpose (I'm going to stop there- I can go on all day) versus a story filled with Gary-Stu's and Mary-Sues, minor characters who are only decoration, little or no parental figures, I can't comment on the plot, having trouble finding a proper one other than a romance theme (which is a genre, not a plot- and I am going to stop there, as I could go on all day).
JKR does not define the perfect man as over-protective, abusive, stalker-like, and over-bearing.
JKR sticks to the rules and boundaries that she sets in her fantasy. For example "no magic can truly bring a person back from the dead" (the stone in the last book doesn't count because they weren't really back in the same essence that they were before) Who wants to bet if HP was written by Ms. Meyer that she would've made Harry's parents come back by the middle of the first book?
Albus Dumbledore... what more is there to say?
The Harry Potter characters do not try to kill themselves because they cannot be with who they want.