Personal “preference” has larger thematic meaning, when viewed in the context of the overarching story; however, before we analyze the ending (via the question) in greater detail, we’re going to briefly lay out the two versions of Pi’s story.
In both accounts, Pi’s father contracts a Japanese ship to transport his family, along with a number of their zoo animals, from India to Canada in an effort to escape political upheaval in their native country. The stories are identical up until Pi climbs aboard the lifeboat (following the sinking of the cargo ship) only re-converging when he is rescued on the Mexican shore. The 227 days that Pi spends lost at sea are up for debate.
The Animal Story
In this version of Pi’s tale, the cargo ship sinks and, during the ensuing chaos, he is joined on the lifeboat by a ragtag group of zoo animals that also managed to escape: an orangutan, a spotted hyena, a zebra with a broken leg, and a Bengal Tiger (named Richard Parker). After some time, Pi watches helplessly as the hyena kills the zebra and then the orangutan before it is, subsequently, dispatched by Richard Parker. Pi then sets about conditioning the tiger through rewarding behavior (food and fresh water), so that the two can co-exist in the boat. Though Pi succeeds, the pair remain on the verge of starvation – until, after several months at sea, they wash ashore an uncharted island packed with fresh vegetation and a bountiful meerkat population. Pi and Richard Parker stuff themselves, but soon discover that the island is home to a carnivorous algae that, when the tide arrives, turns the ground to an acidic trap. Pi realizes that eventually the island will consume them – so he stocks the lifeboat with greens and meerkats and the pair sets sail again. When the lifeboat makes landfall along the Mexican coast, Pi and Richard Parker are once again malnourished – as Pi collapses on the beach, he watches the Bengal Tiger disappear into the jungle without even glancing back.