I have black hair and sometimes i use my Braun with foil system,sometimes i use Wahl clipper.
I have never use razor to see if it works better on me,because I didn't like the preparation,gels,foams,cuts.
If I use Braun every day the bald spots isn't visible. Of course if you go near the mirror and see better your head you will recognize them. And it's normal...because hairs coming outside from somewhere/holes and you can't change that colour. I think men with light brown or blonde hair didn't have same problem.
Have a nice weekend