Choosing Your 1st Stage SCUBA Regulator

In this video, one of our Scubapro Technicians (Drake Weston), goes over what you need to look for in a 1st stage regulator.
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[@UtubeJunkie81]

Hi, This is by the best video comparing different 1st stages of scubapro. Thank you for that.
I am considering to buy MK17. However, I have found 2 options there, MK17 and MK17 Evo. Is there a difference between them?
Since their Evo line up mainly means the blue coating preventing ice build, how would they do that in a diaphragm design when it is already sealed?
Also, if MK11 is also diaphragm design, doesn't it inherently make it sealed?
I would greatly appreciate it if you could answer those.
Cheers