How does the Matchcomposer really work?

Games Halo: The Master Chief Collection
1

Do people only get matched with exact the same settings (gametypes seleceted) or will I get matched with people with other settings?

For example: I like to play H3 social slayer + Koth but I select H4 as well for a higher chance. The wait time is awesome, less than 60sec to start a game. But sometimes I select H3+H4, Slayer, Koth, Griftball, Actionsack, SWAT, and Snipers but most of the time it is slower.

2

Hello,

You will find people who search the same criterias as yours.
Meaning that if you search for H3 + H4 and someone is searching for only H3, you will probably be with the one who is searching for only H3 if there is no people on H4.
About the time, what I think is : It can be slower if there is less people in the others playlists because it will search people in all the playlists you selected.