Less than a year after the first generation of smaller tablets gained traction, a second generation of 7-inchers has arrived — the Google Nexus 7 launched in July and the Amazon Kindle Fire HD in September. There are many other manufacturers making small tablets, but these are the only models seeing significant demand. As we’ll see, in this short period of time these mini tablets have evolved into first-tier products with excellent displays that outperform most full-size higher-priced tablets. But which is best?