416-401, longer distance, but two lanes for each direction on hwy 416, seperator in the middle, safer to drive and easier to pass.
7-401, shorter distance, two lane hwy on 7, hence more dangers to drive and harder to pass, especially when one slow car that jammed up other cars in the front of yours.
I heard there is a federal-provincial plan to make #7 multi-laned. Then again, this is Canada and it is likely to happen in 2010+ (when even the Moon will be visited the second time ).