Ogdensburg/Prescott border crossing is open 24 hours and would be my choice due to border crossing traffic volume.

I'd take I-91 north from CT up to I-90 to Albany NY and stay on I-90 to Utica NY.

You could then stay on I-90 west to Syracuse NY, then north on I-81 right up to the Alexandria Bay, NY border, once in Canada take 401 east,

then 416 north to Ottawa.

Or... at Utica , you could head north from Utica on 12, runs into 26 north at Lowville, NY and straight on to the Alex Bay border.

I have travelled both ways... takes about the same time, 12 and 26 is more scenic.

But... if I was doing the 26 north, I'd catch 37 east to Ogdensburg border crossing into Canada.

The reason being , it is a smaller border point, less traffic than Alexandria Bay crossing into Canada which is quite busy.

And as stated the Ogdensburg crossing is basically a direct run into Ottawa when you get on 416 north in Canada.