A lot of people seem to like BH over Juggs and Assassins purely b/c they don't take as much spike damage due to higher chance to shield. So that means healing them is a little more predictable. Besides that, they have really good mitigation, strong AoE and decent CDs. However every class is endgame tank viable so pick one you like. I mainly picked BH b/c I liked their skillset more as a tank.