I have no experience with bears, but I highly recommend avoiding B118. Over half of the trees I have on that rootstock are falling over. Other people at various locations around the country are having the same issue. You probably already know that Antonovka will give you a larger tree than MM111, but fruiting generally takes a few more years to start. Good luck.
PS - I'm piling dirt high around my B118 trees, hoping that they take root above the B118 rootstock. Time will tell if it works, but at least the weight of the extra dirt and bracing are keeping them from falling over right now.