How big are the giants? Because that makes all the difference. Tigers are really ferocious powerful animals, even if you’re like 15 feet tall you’re done for, I’d say even if you’re 2 or 3 stories tall and the tiger is the size of a normal housecat to you I would not count out a tiger to be able to cause you enough damage and pain to put you down, but if these giants are like the size of skyscrapers then the tigers have no chance obviously. I’m putting my money on the tigers unless the giants are just ungodly huge.