Either plan would work. Luke’s plan is designed for 50km races, so that’s probably the best fit. For Mike’s plan, you could scale it as required for your goal race.
As far as strength work goes, Luke’s plan has some functional runner strength sessions while Mike’s includes one of our gym-based ME progressions. Both plans then progress into higher intensity speed work.
With the mountaineering plans, the heavy carries wouldn’t be good training for an ultra. That type of ME work is too slow for run training.