I let my spiders live rent-free

Spiders. They do not bother me usually.

Definitely not flies, those things are nasty. And they come from maggots. Ants or spiders, I'm not sure. Ants seem to be more of a nuisance...they get into all your snacks, and when you have ants, you tend to have a lot of them. And the red ones bite. Spiders, on the other hand, can be venomous and can even kill you if they're the wrong species. So idk. I guess spiders (most of them are harmless).

Spiders

spiders, if anything they will eat the others anyway - unless it's venomous or the size of a rat and then it's time to burn the house down and move on with my life

I would say ants because they are cute but then I remembered they bite and even steal my cat's food, so I choose flies.