check out this thread to help you make a better thread IF you don't find anything through search bar.
But personally I have a 60d and I can vouch for it. Solid build, lots of canon accessories available and great quality camera overall. The key is the lens however, because it becomes obvious when you cheap out on that. Unless you're a pro photographer ( which I presume you're not cause you don't know about these two cameras) having a super expensive camera is not vital.
I haven't used the GH3 though so I can't compare
Dr. King Schultz: Auf wiedersehen. Bullseye.
Calvin Candie: You sir are a sore loser.
Dr. King Schultz: And you are an abysmal winner