Out of the three, which one takes longer to fix: widely spaced teeth, really crowded teeth, or crooked teeth?

Guess at lottery: All the situations you mentioned will take time. And you do not to rush things with orthodontics. Most conditions can be fixed with braces alone, but sometimes surgery is needed. I see your age is 44, with that you definitely want to take time moving teeth. Moving them too fast as a adult could cause more trouble than you think. Like root resorption.

Consultation needed: Your question is too broad and has insufficient information in order to give you an answer that will be helpful. Each case is different and needs to be evaluated by a personal clinical examination along with x-rays of the teeth. If you have a specific problem or need, i suggest you consult with a general dentist first who can refer you to an orthodontist.

Equal: Depends on severity, not the kind, of malrelationship. Every child is different, so go see an orthodontic specialist who can guide you on the best way to resolve your child's problems.