I've had both: my S3 for four months and my Note 2 for 4 months as well. I prefer the Note 2. Better battery life, bigger screen, speed and accuracy with the included S Pen (you can buy a C Pen separate for the S3) when it comes to Swyping, faster transitions between apps.

Honestly, if I had the S3 still, I'd buy the S4 when it releases. With my Note 2, I feel no need to upgrade to the S4.