Unlike the prairie you only experience headwinds between Calgary and Canmore. Maybe Lake Louise on a bad day. After that it's variable.

However, going east from Vancouver you have one of three passes to climb (Coquihalla, Alison, Fraser Canyon) plus the Kicking Horse. Roger's is up and down either way.

The climb up Alison pass in Manning is 60 kms long. The climb up the Coke is steep and again out of Merrit is long and sustained. The Kicking Horse can also be a tough slog. In comparison once past Lake Louise you can mostly coast to Golden. All of Yoho is downhill (going west)

Banff Park is flat, Yoho is downhill. Golden is up and down. Roger's Pass is up and over. Revelstoke is up and down and then flat to Kamloops. Kamloops to hope is two humps of a camel but decidedly downhill overall and Hope to Vancouver is flat.