Know this before you post, updates for matchmakeing are coming so swat and some other gametypes will come soon.
I myself would choose Dominion. I was a Invasion fan in reach so Dominion seems really cool, its like combining Invasion with Territories.
Also like how you can upgrade the bases and have turrets and pop up barriers.
Also flood looks awsome too. Like how you can become the halos version of a zombie which is actually some kind of parasite/spore takeing control of your dead body and useing it as a puppet whislt transforming it into a hidious monster while a zombie is just a person brought back from the dead becuase of black magic and or some kind of virus bringing your body back to life but only giveing you a primitive brain to use makeing one more rabid and hostile.
Wow that was a mouthfull!
I really enjoy Dominion as well. I am actually working on forging a map made just for that gametype.
Flood, the infection I actually enjoy. I thought for sure, I would not enjoy it at all because guns vs swords was annoying to me. That changed.
Big team Infinity slayer is quite nice. Now I can actually get my power weapons and no one is camping them. That is the major reason why I prefer infinity slayer over regular.
Regicide is the only FFA that is actually not just any old FFA from the past. I fairly enjoy it a bit more.
Those are my top 4 game types.
My number one gametype is Dominion. I was a huge territories fan which is why I really enjoy this. It’s like territories with fortifications. Something I have been trying to make since halo 3.