This will also apply for other exercises such as squats vs smith machine squats / leg presses and etc... (getthisstrength.com)
Take the bench press for example, there was a study comparing smith machine bench press vs free weight bench press: (getthisstrength.com)
Or join the ranks of elite athletes and specially trained military units with world class training facilities using smith machines and power racks or bodyweight suspension trainers. (americanfitness.net)