I am debating between two connecting flights:

Thu, Apr 21 Punta Cana 1291 2:20pm 6:45pm Toronto
Thu, Apr 21 Toronto 466 8:00pm 9:01pm Ottawa
1hr15min connection

or

Thu, Apr 21 Punta Cana 1291 2:20pm 6:45pm Toronto
Thu, Apr 21 Toronto 470 11:00pm 12:01am Ottawa
4hr15min connection

I would prefer not to have a 4 hr connection time, but is 1hr 15min too short? Can anyone tell me if we go through customs in yyz?