Is time or money the deciding factor in how you get to/from an airport? Maybe both hold equal sway. Director of MileCards.com, Brian Karimzad, details if the train, Uber/Lyft, or taxi will save you time and/or money in various cities.
To find out if the airport you're heading to has the best or worst transportation check out this article: http://milecards.com/best-airports-for-transit-global-and-u-s-2017-rankings/ Salt Lake City was ranked 8th best in the U.S. for light rail transportation the the airport.
Best advice is to research your options before you go and know if you prefer to save money, time or both.