What's the Difference ?

They "should" sound exactly the same. They both seem to have the same specs in what would matter for your sound.
 
Get the cheaper one. The extra $50 is for the shielding which only people with EMI issues need and even then I doubt it helps.
 
Just to weigh in on what spaceman said, there's no data available to suggest that the EMI shield has any effect at all -- and similarly no evidence to suggest that it doesn't. But, naturally, it's better to assume that it doesn't make any difference :)

 
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