They were both decent. I think I had less traffic on 61 but can't swear to it.
The speed limit on Trans Canada 90km and most people did 100 or better. Most of it had good paved shoulder; but some was narrow. If your using a mountian bike going into the gravel on some of the shoulders isn't a problem. I did some test rides into the gravel with my 700c 32 tires on my road bike and it was OK. Traffic was moderate. I'd have several cars and trucks go by and then wouldn't have any for 10 minutes or so. Some of the truck traffic was a bit unnerving. Some got a little close. Actual road conditions were nice all the way around. ALWAYS BE ALERT!