Hi everybody. I would like to host some pen and paper game nights for some friends. Due to the limited time because of work and all I want to decide for a system that needs only very low preparation time.

Forbidden Lands seems like it can be run on the fly with all the random stuff that you can roll on if you are good at improvising and the worldmap that can be influenced by the players with all those stickers seems interesting too.

Mutant Year Zero seems cool do but can it also be run on the fly? Does it also have some kind of world building that the group can influence?

Symbaroum seems cool too but I barely know anything about it.

How do these 3 games compare to each other in regards of how much time you need to prepare the sessions.