South of Radium the AC Route is nice but not spectacular. Hwy 93 has a fair amount of traffic - sometimes with a shoulder, sometimes not. Hwy 3 over Crowsnest is fairly busy, but I remember a small shoulder much of the time. The route thru Kananaskis is far more scenic - plus there are facilities (stores, campgrounds) spaced along the way. It's off route to camp right at Kananaskis Lakes but well worth it - the walk-in campsites are right on the lakeshore with sublime views into the mountains. It's a good climb to Highwood Pass, but then all downhill to the junction where there's a store and nearby campground. Then a riverside ride to Longview. Hwy 22 is like Hwys 93 & 3 - - moderate traffic but with a shoulder. It's nice high grasslands/foothills.

From Castle Junction to Lundbreck it's actually a little shorter going by way of Kananaskis - even when you stay to the pavement. I'm guessing 360 vs. 420 kms.

Pic of Highwood Pass