Series? Or Stand-alone books?

It really depends.  I read both.  However, I do have a condition for reading series.  I hate to read series until they are all published.  I don't want to get into a story, like really into it, and then have to wait 1-2 years for the next chapter.  Makes me angry.  Of course, this past couple of months I started Melissa de la Cruz's Blue Bloods series.  And of course not all of the books have been published. Argh!!  Why did I start this series?  I'm really kicking myself now, but I'm invested in the story.  Thankfully I just got Misguided Angel from the library (had to get it from holds) and the side book, Bloody Valentine.  Unfortunately the next book won't be published until later this year.  I don't know if I can wait!!!  But if I actually follow my rules, I do like to read series.