Alright players – talk to me about your favorite system you’ve never played.

I’ll start with Chaosium’s Call of Cthulhu! I’ve listened to several actual play podcasts, but I’ve never had the opportunity to play. I’ve DM’d D&D 3.5 & 5e, so I’d like to DM CoC as much as I’d like to play. Horror on the Orient Express is an amazing looking campaign, but I’d love to convert the setting to a 1870’s America – during our railroad expansion era.

Thoughts?