In case the terminology may be foreign to you, "wait longer" and "let the ball travel" means let the ball get deeper into the swing zone. Then go with the pitch. You will be more successful driving curves the other way. If you try to pull them you'll hit into a double play. However, if you see a hanging curve (flat break/mostly spin) jump on it, pull it and crush it. A friend's son played at Oklahoma State when they were known as Hitter's U. They were told not to swing at curves until two strikes. At high school and below chances are you're not going to see two high quality curves in the same at bat.