Early morning workout. What kind of carbs?

Is it better to have oatmeal before an early morning workout or would just a banana be fine (with protein of course, but I'm just wondering what kind of carbs)? I've been having eggs and oatmeal before and whey and dextrose after. But would sugary carbs be better before and whole grain carbs be better after? I workout hard for about an hour at about 5:00 am. I'm 5'5 145 lbs, could use a little more muscle but not trying to add any fat

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