Easiest to K.O. If you build a small pen and trap him. Because of how easy it is to kill them, I found great success in knocking out a Dino (phiomas/parasaurs) out first, and dropping the bear next to them. Start tranqing the bear and sit behind the other knocked out Dino. When he attacks you he will kill and eat the other one restoring a good deal of Health and you don't even have to worry about killing him.
Best utility mount after theri can gather meat and berries also this guy can get 1k weight and almost 900 melee with enough lvls I know this because my bear ( name is teddy the bear) is stronger than my 209 Rex