Before or After Exercise?

There's no "best" time to eat your meals. Eat when you feel like your body needs it. For me, I find that a small snack after work before my workout (usually a protein bar) gives me enough energy for my workout, and I eat my main meal around 7pm when I get home. It's all a matter of personal preference.

You should, however, always have SOMETHING to eat post-workout. Something high protein and/or high carb (depending on if you were weight training or doing cardio that day). Post-workout nutrition is equally as important as the actual workout.

Do what works for you? I typically have a small snack before a workout so that I am not hungry or faint. I never eat big before a workout because it will upset my stomach.

I'd have it after. Today I'll be at the gym 6-730ish which for me would mean I'd need to eat my dinner at around 430/5, any later and I'll feel uncomfortably full during my workout. So instead I eat a snack at 5/530 and have dinner as soon as I get home, around 8.
But that's personal, if you'd rather swap the meal and snack around, then by all means