What are the best fisheye lenses compatible with the Canon Rebel T3i?

Some of the best fisheye lenses compatible with the Canon Rebel T3i are the Canon EF 8-15mm f/4L Fisheye, Sigma 15mm f/2.8 EX DG Diagonal Fisheye, and Rokinon 8mm f/3.5 HD Fisheye.