Subject: What animal is more dominate a siberian tiger or a polar bear ?

If a siberian tiger and a polar bear shared the same territory 
which predator would be more dominate ? Is there any area in the 
world where tigers and large bears { grizzly, brown , polar }
live together ? I know in parts of Asia that sun and maybe 
kodiak bears do and in russia there is a small population of 
brown bears that may come close ? Would they coexsist together? 
Would you agree tigers and polar bears are the toughest two land 
animals ? Have they ever lived in an area where their paths have 
crossed ? If you could respond I would appreciate it. This has 
been a debate w/ my friends all school year ?
Thank you,
Gordan   

Re: What animal is more dominate a siberian tiger or a polar bear ?