Depends on what you mean by competitive. I think in either the WHL, OHL, or QMJHL they would be a playoff team and be competitive. However if they played in the Memorial Cup I don't know. I just don't know.
I think the Gamblers would be very competitive in the CHL. The main difference I see between the CHL and the USHL is the depth. The bottom CHL teams are still far superior to the bottom USHL teams. Up top it's pretty close.