I'm playing a lot of Commander and some Modern and Pioneer. Will be dipping my toes into fully proxied Legacy soon. Overall, I prefer the theme building and deckbuilding freedom in Commander, but I can also appreciate the 60 card competitive gameplay.
Recently I scrapped my Perrie, the Pulverizer deck after it wasn't performing. I turned it into a Denry Klin deck, hoping to try that out soon!
I remember playing this with a friend. We modified the source code to allow us to use the fast-forward functionality in an online mutiplayer game. Once we figured out how to make proper grade-separated junctions, it ended up becoming quite a tedium. I wish Transport Fever had a multiplayer mode.