Both about the same. Try maple syrup. A little goes a long way for oatmeal. Oatmeal is great with a touch of syrup and some chopped pecans.
It still took me a while to find how I liked my oatmeal. Couldn’t really eat it until I found what worked for me. Some people like Uber mush Like a porridge, I like mine using old fashioned oats with far too much skim milk and microwaved for only 1 minute. Almost like a traditional breakfast cereal. Stay away from minute oats unless you are having trouble finding the right consistency with old fashioned. My fiancée likes overnight oats where she adds a bunch of spices like allspice, cinnamon , nutmeg, etc. then she adds chia seeds and unsweetened vanilla almond milk and lets it sit overnight in the fridge.
Steel cut oats are far too much work IMO. But some people swear by them.
Edit: one more note, brown sugar adds flavor where white sugar doesn’t. I don’t make cookies anymore with white sugar unless I know the recipe needs it. Makes for softer and chewier cookies. White sugar I only use when I need to make something like a gastrique, but even then alternate sugars would probably work there.