which is a better spdif-to-cmos converter?

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Here are 2 slightly different designs of the spdif to cmos converter, both using unbuffered inverters, taken from this forum. If we incorporate Fred's suggestions of configuring the inverter for a gain of ~25 for the second design, and then compare it to the first design, which one would be the better design, technical wise and sound wise?
 

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2nd design

insert 2k resistor in series with c2, and change r1 to 50k.
 

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  • spdifinput.jpg
    spdifinput.jpg
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