Depends what you're using it for. Multipurpose, easy to travel around or move case would be #2. Plus, I think they look way better.
But case #1 still is a classic. Great airflow, good case design, lotsa room. I don't know, I had a yellow one for a year or so and I loved it.
Hrmm, so in conclusion... I say Case #2, it's becoming more popular as of recent for a reason probably. And it has a dope paint job.