Should I watch Transformers 3 in 2d, 3d, or IMAX 3d?

2d is like $9, 3d is $13, and IMAX 3d is $18. If you think 3D is the
way to go, do u think i should see it in IMAX or just normal 3D and
save the money? Is there a big difference between the two 3Ds?