Usually Normal, and usually I'll stick with that. Except in Mount & Blade where I put everything on hardest except combat speed to slow simply because I'm a slow person ion general, which may also explain why I play other games on normal usually. When a game forces me to hurry and be faster, that's stressful and the fun ends for me, so I usually stick with normal, I may try a bit higher if normal is too easy but usually it's fine and if the AI just gets more hitpoints or so I often don't like it, similar to what Quirinus says.