I have been running a very simplified and chopped down version of gurps about surviving a dangerous British town as a group of orphans trying to pay their rent. Its been really fun despite me being rather new to the system and to DMing in general.

I think if I wanted to expand on different systems, I'd wanna try more "toolbox", genre-less types of RPGs, though less crunchy like FUDGE or even risus. I like the flexibility those types of RPGs give in making your own world and being able to pick and choose rules. But i may stick with gurps for now because it already has that and I also like a simulation type of rpg. It has a noice amount of crunch that I appreciate.