Snoqualmie is easier depending on when you are traveling. The worst time to cross is Sunday afternoon. Too many heading to the rainy side at one time and the backups can be horrific. We just simply avoid Sunday PMs. Stevens is steep, but so is the last couple of miles on Snoqualmie, but a nice drive. We have been over both with the trailer and down the Columbia. The last time down, we used more gas than we did going up. Strong West winds in the Gorge but fun watching the Kite boarders and sail boarders.