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I'm not sure that polar bear does taste good. At least not for us. The global orca diet is not the individual orca diet. For instance if an injured seal is swimming near orcas that have a diet of salmon, jellyfish, and plankton, then even though other orcas eat them, that seal is, probably, safe.
I'm explaining this badly. Basically all the Orca worldwide will eat everything, but a single pod of orca have set diets that they go after almost exclusively. Apparently some of the polar pods have decided that polar bears are worth the trouble, which isn't surprising. The average Orca is about 2-3 times the size of a polar bear. They can bite them almost in half, if they needed to.
It's not so much that anything tastes "good" as far as I can tell, so much as their pod has eaten "this plentiful food" in "this particular area where we live" for thousands, if not millions, of years. It's what they are used to, and what their guts expect more than anything.
As far as I can tell, any Orca can eat anything, just like us. If that food wasn't what they're used to eating it will give them digestive issues such as gas or heartburn, just like us.