I agree with you OP, i'd rather have cancer as well. Many people have disagreed with you, but let's think about this logically
Social Impact :
-As an average young bald guy who doesn't carry the look well you get treated like a piece of subhuman sh*t. You will never be taken seriously, you will be treated as a joke, no one will even care about your problems and if someone does they're just gonna pity you and give you bullshit advice to make you feel better. It's just a complete social death sentence with few exceptions
-As a cancer patient you get treated like a saint or a hero by everyone. Everyone sympathizes with you and they make sure not to hurt you in anyway and you gain respect as someone battling a tough situation. You will simply be treated as good as you can get treated and even after you beat it you will keep the respect for a long time
Romantic Impact :
-A young bald guy is unattractive plain and simple, yeah there're are some exceptions, but we can all agree that once you go bald young without anything to make up for it you're basically fucked in the women's department especially in this day and age
-A cancer sufferer can still meet women and get relationships if he's not in a one already and his partner might get even more attracted to him due to his elevated status and she will very rarely leave him just to not be seen as an a**h** by everyone. You can have romantic relationships easily as a cancer sufferer unlike a young bald guy
Self Image and esteem :
-We're all balding or bald and we know how that affects self image and esteem so there's no need to dive more into that since we already know they get both get destroyed
-As a cancer sufferer you will probably either maintain your self image and esteem or have them increased due to the amount of validation and support you receive daily for your situation
Death :
-A young bald guy is already dead except his body is alive and i'm sure most young bald guys think about death and suicide every once in a while if not often and death is a better fate than looking like a circus freak
-If you live and beat cancer your life will get marginally better and if you die the pain stops and both cases are still a hundred times better than being a bald young guy
If you disagree with all of that you're not thinking logically and you're just being emotional. Cancer is overrated and people need to pay more attention to young men getting disfigured by this curse instead