Which of these cases is higher quality?

I vote Ringke. I have owned their products and have always been high quality.
 
Spigen is good too. I'd say go with the one you like more as quality is likely similar.

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I haven't used the first case you mention but I have used Spigen almost exclusively for a pocket case and Seidio for the case with a holster.

Spigen Slim Armor is a good case.

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I ordered both of those and I received the first one. The Ringke looked/felt cheap to me and the Spigen Ultra Hybrid will come in today so I'll let you know. I'm sending back the Ringke.