Which system builds more muscle mass free weights or isokinetic machines?

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It really depends on what your goal are and what is being done. They both enjoy their places, strengths and weaknesses.
Typically you'll see better results from free weights, especially if the purpose is strength and hypertrophy.
Free weights utilize three points of leverage as opposed to one and only two with a apparatus. Free weights also typically utilize more muscles in the heave. Machines have a predetermined footprints of movement that may be restrictive to optimal growth, and tend to isolate muscle groups more.
However, machines have an authority of avoiding regressive training, where vitally you have a constant nouns throughout the entire range of motion you may not other get from free weights. But this can be reduced on free weights beside proper training techniques.
Another profit of machines is that you usually do not need a spotter to move up safely. This isn't true beside all machines but probably most enjoy safetly mechanisms built within.
For the most part, if you do utilize machines, using free weights surrounded by the beginning of your workout is optimal. Only use machines to supplement free weights.
Free weights because you enjoy to use your isolator muscles. That means working the smaller supporting muscles, thus creating more muscle mass.