I've driven bits and pieces of 95 in northern Idaho. Lots of towns and vacation areas. At Lewiston it drops down a good grade to the Snake River level, climbs again to Granger, and another drop at Whitebird (Salmon River). Then a gradual climb to New(something or other). McCall to the east is vacation area around a big lake. 95 to the west and south crosses a dryer area, and then enters the farming lands around the Ontario and Boise.
From there south 95 is in semi-desert, to Jordan Valley (a Basque community) and into pretty remote parts of Oregon and Nevada. I'm less sure about the Nevada stretch. I think you cut off some corner. Much of it is the main route between Reno and Vegas.
93 goes to the Kalispell area, the west side of Glacier NP, then Missoula. Then a string of towns and a climb to Lost Trail Pass on the stateline. Then a drop to Salmon, ID (the other end of the Salmon River). Then through broad valleys to the Snake River plain. Then Twin Falls and on to Nevada (at lot of the employees at the casino in NV live in Twin Falls). 93 seems to be a favorite alternative to I15 for Albertans heading south to Vegas.
I suspect in Nevada 93 and 95 are similar in quality, scenery, and services. They differ more in north, several deep river crossings versus one big pass.