Each guide is built around a decision — choosing the trail, the Trolltunga season window, and trailhead access — not a list of viewpoints.
Both are long-remembered hikes, but they are not the same commitment. Preikestolen is a moderate half-day from Stavanger; Trolltunga is a very demanding mountain day that only works with summer timing, strong fitness, an early start, and a solved access plan.
Do you have the fitness, daylight, and access plan for a 20 to 27 km mountain day, or is a moderate half-day hike the realistic choice?
Trolltunga has an official independent-hike window of June 1 to September 30. Outside it, snow, ice, short daylight, and avalanche risk make an unguided attempt a safety problem, not a stretch goal.
Is your Trolltunga date inside the June to September independent window, or does the plan need a guide and winter judgement?
Most failed Norway hikes break at the trailhead, not on the trail. Preikestolen depends on parking pressure and seasonal transport; Trolltunga depends on the P1, P2, and P3 parking choice and the Odda and P2 shuttles.
Is your trailhead access — parking or shuttle — actually solved for the date and start time, or only assumed?