Shorter workouts more days a week?

Anonymous
what gets better workout results? working out a good 4 or 5 times a week for 40 to 50 minutes and switching it up different machines on different days? Or working out 3 days a week for 75 minutes or so, with different machines? Weight machines included in either situation. And both workouts are intense but obviously the longer one burns a higher amount of calories.
Shorter workouts more days a week?
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