There are advantages and disadvantages to both routes. If a spot on the US Development Team is offered, that is by far the most advantageous route available to a US hockey player. After the 2 years with the development, a player is eligible for the NHL draft (assuming they were born before Sept. 15). Since they were not drafted from a CHL team, they have 4 years to sign. This can give them the opportunity to play 4 years in College Hockey if so desired. If their NHL decides to sign them, they can play in the AHL.
Going to play US College Hockey can have its drawbacks. The season starts in October and the National Championship is done in early April. The regular season is about 40 games with about 10 or 12 more games if your team goes to the National Championship. This compares to a CHL schedule of 68 games plus playoffs that could be more than 20 games plus the Mem Cup. The NCAA also requires players to go to class. This is a positive for some and a negative to others.
The USHL and NAHL are focused on developing players for the NCAA. Players drafted from the USHL do not make the jump directly to the NHL (unless they are on the Development Team). Their focus is not the NHL as it is with the CHL. The CHL does offer the scholarship package, recognizing that the majority of their players will never be Pros.
Which route to take is a difficult choice for a player and their parents. A player with extraordinary talent will become an NHL star whichever route he chooses.