It was way better of course. The Optimus forest fight, everything with Devastator and the final fight with the Fallen were all filmed with IMAX so they took up the entire screen. Also, there was a random shot of a jet taking off that was filmed in IMAX, not sure why. IMAX is almost always more worth it than a regular screening, if not for the visual quality, at least for the sound. The sound is always way more impressive in IMAX.
It was cool because before the movie the manager came in our screening and he asked the audience trivia and if you got the question right you got free stuff. The first question he asked was who played the voice of the original Megatron and my younger brother and I raised our hands at the same time and he called on him instead, and my brother didn't even know the answer so I had to whisper it to him, lol. He got a free Transformers shirt and a copy of the CD. It was pretty cool, definitely a good way to get us all pumped.