Which of these series should I read next?

i would say, mortal instruments and morganville. the mortal instruments has plentttyyy of action and suspense, with some romance added to the mix. as for morganville vampires...its the BEST book EVER. i could read it over 100 times and still not be tired of it,its amazing, it has a ton a action(i mean come on its a town of vampires and humans!) and just as much romance! i have also read house of night and vampire academy, and i say morganville is better. i hope i have helped you with your decision