The FX3 OR A7S MKIII?

[insch01]

I was planning to get an A7S MKIII until I was made aware of the FX3. I will primarily use this camera for 4K filming and have been advised that it's a better camera than the A7S for that task. From what I can see, the main differences for the FX3 are no electronic viewfinder but several mounting points, hence no essentail need for a cage. And a handle with XLR points. I have an Atomos Ninja V monitor/recorder that I could use with the FX3 to maximise its potential.

Is this the best DSLR camera for 4K at this price range?

Thank you.