Based on my experience with either animal, which isnt a lot but more than average. I volunteered at a wildlife rescue where there was a bear and he was awesome and living out in the sticks ive seen my share of deer activity. The bear would chew on a turnbuckle for a while, the deer would flip the fuck out, try to jump over the ropes and leave but most likely get caught on it and break it’s neck. The bear would win but no one would go home feeling satisfied at all