No, I mean, if this were a "favorite animal to morph" thing, mine would be a tiger, easily.
I just can't see how a bear would be able to BEND DOWN, flip a VEHICLE-SIZED lizard onto its back and STAB at its belly, all before the big freakin' lizard could crush every bone in its legs and send it tumbling to the ground for an easy kill.
Obviously a grizzly is the baddest predatorial mammal on the planet, I just think at close quarters the whole "bend scoop flip stab" thing would take somewhat longer than it would take for a big-ass crocodile to rush in a straight line and crush a whole lot of bear bones in between steel jaws.
As for speed, that's true of crocodiles over significant distance. If we're talking about 10-20 meters in a straight line, no turning or shifting axis? They're actually incredibly damn fast. Like lightning, man. If you're ever chased by a crocodile or alligator, you zig-zag and change direction and stuff. That's because if you don't, you're meat.