M-audio ProKeys 88 vs. Casio PX120CSS, which one is better?

Question by Nikrad: M-audio ProKeys 88 vs. Casio PX120CSS, which one is better?
How do you compare the M-audio ProKeys 88 - 88-Key Hammer-Action Premium Stage Piano with the Casio PX120CSSP Portable Keyboard with 88 Piano-Size Hammer-Action Keys?

I have been playing other instruments for a couple of years, and now I want to start learning the piano. I'm looking for a good digital piano with high-quality piano sounds and hammer-action keys. I want to be able to use it as a MIDI controller as

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