Hi for learning,
If you learn the reason why "recommend" and "want" take different constructions, is that going to help you use them better?
I'm not too sure that it will. I think that the best way to treat these kinds of problems is to memorize them one by one, and then as you're learning them you'll start to notice patterns.
For example, you'll notice that "suggest" works the same way as "recommend", but "urge" works like "want".
Something else you might notice is that, when you take "you" out of the sentence, "suggest" and "recommend" are followed by a gerund ("I recommend buying a ticket") while "want" is followed by the infinitive ("I want to buy a ticket")
Sorry not to give a clear answer as to "why" one is used rather than the other, but that's because I can't think of any rule that will reliably help you to pick which construction to use with a certain verb. I think memorization is your best option.
Student or Learner