Yes, current form is important. But this is trumped by situation when it comes to the long grind-out season of the NBA. The Jazz have that key element going here along with a powerful home history against the Nuggets.
Utah has lost four in a row. The Jazz also haven't played in four days. They are going to be ready for this matchup especially after losing six days ago to the Nuggets, 106-100, on the road. The Jazz played at San Antonio the previous night before losing to the Nuggets. Utah still might have beaten Denver if star guard Donovan Mitchell would have had just a normal game. Instead, Mitchell had one of his worst games of the season missing 11 of 12 shots from the field. 
This time around it's the Nuggets who are without rest facing a revenge-minded, ravenous Jazz squad. Denver is coming off an impressive, 127-99, home win against the Trail Blazers Tuesday night. 
Jamal Muray returned from injury for Denver aginst the Trail Blazers. However, forward Jerami Grant suffered an ankle injury. Denver already is without big men Paul Millsap and Mason Plumlee. Michael Porter could be out, too, severely restricting Denver's frontcourt depth. Grant, Millsap and Plumlee are Denver's best interior defenders. Rudy Gobert should be able to dominate inside while an obviously highly motivated Mitchell should produce big in the backcourt. 
Denver is 4-11 ATS following a victory and 3-7 ATS when playing without rest. The Nuggets also have failed to cover in 10 of their last 11 visits to Salt Lake City losing on the road to the Jazz the past nine times.