What are your favourite and least favourite weapons in the Halo series?

With each Halo game in the series, we have been greeted with some great weapons and some weapons that are not so great.

When it comes to all the weapons we have seen in the Halo series, which would you say is your favourite and which would you say is your least favourite? What are your reasons for these choices?

The best guns in Halo series depends on the situation you find yourself in. But it's going to be Battle Rifle (BR75) that's my favourite gun. It's one of my best in Halo Infinite.