why is bo3 better than bo4

bo3 in my opinion is up in the rankings with bo2 which in my opinion is one of the best bo's but i think they completely messed up in bo4 introducing battle royale and a whole new setup

It's because Black Ops 3 was just the move, it had everything from BO2 mostly but just polished up and more maps and weapons. Nothing will ever beat Black Ops 2 out of all blackops( actually maybe bo1 but I like bo2 more) black ops 2 had the best zombie maps out of every cod in my opinion.