The way my squad like to use those 2 are: If we want to deny breaches like in any of the garage objectives, where securing the wall can basically win you the round, bandit is better.

If you want to deny information to your enemy team, so that you can surprise them or use any strategy, mute is better.

Examples: As I said, if you are defending any garage objectives, mute wont do much as thatcher can just destroy your jammers from the other side and the the wall will be destroyed. You need to have a bandit that can do a bandit trick if you want to secure that wall.

On the other hand, consider laundry on Oregon. Mira is a very important part of the defence and keeping the 2 mira windows intact is very important. Bandit wont do much in this case as you need to protect those windows from twitch drones, also from hibana etc. Mute can also help jam the hatch from below and if they dont have a thatcher, you need to come down and break the jammer manually. In this case mute can waste a lot of time for the attackers and is a much better choice.