Perhaps I'm a little bias since they tried to say Stephanie Meyer was the next JK Rowling... and they said that definitely prematurely but...
1.) Twilight is almost a direct rip off of the Sookie Stackhouse series (Trueblood) and isn't even as good.
Harry Potter is definitely an original!
2.) JK gave us a completely original world that was side by side ours yet perfectly hidden with so much to offer and new things to have in over 7 books, it truly was the world that kept on giving...
Meyer gave us some redneck town that was sooo stupid they couldn't even noticed the literal white doctor that looked like he belonged in the morgue, seriously if someone was looking like that at any hospital I went too I would not feel comfortable with him operating on me...
3.) JK Rowling gave us a series that build upon itself, As Harry aged and the world got darker you felt it so that before you knew it they were speaking on more adult level themes and yet you really didn't see it coming.
Meyer kept her 100 year old Vampire trapped as a 17 year old, the adult topics were relatively cut down and given an excuse as to why so that when your reading it you just feel like the Vampires are trapped in two worlds that they really don't belong in.
4.) Harry Potter is the type of book you can read when you are seven and then read again and again no matter what age you are and yet never feel like it's old and probably find newer things that you didn't catch before (even in the earlier books)
Meyers book is really directed at only one type of readers and everyone else is just like.... okay...... that's why it's more of an obsession between teen and young adult women, year there's others but not really....
5.) If your gonna pump everyone up for an Epic end battle, follow Rowling's example and do it! Even the most die hard Twilight fans had to admit the ending to the last book was just horrible!