Which Schema plugin is best?

There’s several wordpress plugins that have emerged for Schema mark-up. I don’t mind paying for a premium plugin but that still leaves a handful of options. It’s hard to determine which is truly the best/most robust. What are your thoughts/experiences with the below plugins? I’m leaning toward WP Rich Snippets or Schema App Structured Data.

WP Social
WP Rich Snippets
WP SEO Structured Data Schema
Schema App Structured Data

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