You don't necessarily need to argue a lot of times. Often the much better way is to deploy the rhetoric equivalent of a Judo throw, by using the momentum of the other side and ever so gently redirect it to have them lose their footing a few steps later. Do this well enough and it isn't even immediately clear who caused it.

Directly arguing has the downside that people with big egos will harden their positions even (or rather: especially) if they suspect they they might be wrong. If your goal is to let of steam while causing destruction, that is a valid strategy, if your goal is to reframe a topic, refute a point and/or win over the room, it often is not.

That all being said, we are talking about a public argument, not about private discussions. If you can make good points, bring the receipts arguing for those points is a good idea. However if given the chance it is a good idea to make these point in a smaller circle, in writing or in a one-in-one with your boss first, to give them the chance to agree with you when it is easy, instead of feeling put on the spot in front of everybody.