Heres an explanation for when you should use both.
This video from thePictureFit YouTube channelexplains the major differences between pumping up with free weights and machines.
Most of the time, free weights (barbells, dumbbells, kettlebells, etc.)
This improves your balance, athleticism, and coordination.
Machines remove the instability from the equation.
This lets your lifting replicate real-life movements.
Machines can restrict this bang out of motion.
you’re free to do just about any punch in of lift with free weights.
Not so with machines designed to do a few particular lifts.
Lifting machines have a much lower learning curve, making them perfect for lifting beginners and the elderly.
you’re able to isolate specific muscle groups a lot easier with a machine.
Overall, free weights are better for building general strength and working the muscles you use naturally.
If you could manage it, learn how to properly lift with free weights.
That said, lifting machines arent useless.
Free Weights vs. Machines| YouTube