In 2012 I pulled a TT on I-80 from SLC to Wells, Nevada at night and I remember only one very long but straight g rade on that section with a few minor curves. Then there was a lot of construction that was bad at night. I have also driven a big part of I80 from the west. You should have it easy.
I have also driven Hwy 50 across all of Utah and Nevada to Reno and only a few short steep grades on sharp curves and it was easy wide two lane with wide shoulders all the way therefore I would think I-80 would be easier as both highways cross the same mountain ranges as I recall.
Be sure and check nvroads.com 511 for road construction especially if you are traveling at night.