Both the 17-40mm and the 70-200mm would give you great imagery.
The 17-40mm obviously would be great to show the entire venue which often makes a nice shot. Some shots from the back, showing the crowd around the big Shamu tank.
The 70-200mm would be excellent to get close-ups of the individual performers and Shamu him or herself.
I prefer to sit a bit further back than the front couple of rows and use a longer focal length lens because persons in the front rows often get splashed when Shamu does a jump. This is of no problem when the day is warm or hot AND IF YOU HAVE NO CAMERA GEAR. Naturally, Shamu's tank is filed with saltwater and will really do a job on camera gear. Just be advised to sit a bit back and or, be ready to cover your gear when a splash is directed your way,