Summer road trip – Stevensville MT to Gardnerville NV

Hi!! First (BIG) road trip, first post! Planning Huntington Beach CA to Yellowstone (via NV and Utah), to Stevensville MT, to Gardenerville NV, and head home back to SoCal!
QUESTION, which route is better to take heading south from Stevensville to Gardnerville I 12/95 or I 93? both appear to be small 2 lane highways? I 12/95 saves 50 miles, but looking for safe and scenic due to Im traveling alone with 2 kids.

Any additional advise welcomed!! Thank you in advance!

The Great American RoadTrip Forum – Planning Summer RoadTrips