Usually a GM, rarely a player. I prefer science-fiction and modern/urban fantasy over medieval or high fantasy. Though I'm currently running multiple groups of Dungeons & Dragons 5th Edition under Adventurers League rules.

Favorite Systems

• FanPro's Shadowrun (Played and run all versions before 5th Edition; haven't had a chance to run 5th yet.)
• White Wolf's Changeling: The Dreaming (I have my shiny 20th Anniversary edition, but i haven't played it.)
• Dream Pod 9's Silhouette (I run Robotech/Macross games, but DP9's Heavy Gear and Jovian Chronicles settings is fabulous, too.)

Note

It goes without stating that a DM can change whatever they'd like, so citing "DM's prerogative" makes any answer moot. The DM can always do whatever they like, so using it as justification just weakens an answer. Interpreting logic and word choice is a different matter.