Actually, all my whale shots were shot with 24-70. I never really used my 70-200 except for a few shots on Tracy Arm day. Personally, I would not even bother with the 70-200.
Damn that whale got close to you. Okay.... I'm going with the 300mm (hopefully I get lucky enough for that type of breaching shot), but I'll have the RX100 on my wrist and ready in case any "close" situations present themselves.