Magento 1 will stop support after November 2018. While magento 2 was release from 2015 with improved performance about from 30% to 50% than magento 1. Your site are faster, easier experience.
Performance
Time for loading page are faster by using php 7, ajax cart, full page cache, varnish cache, private compile...
Community
Magento 2 is open source so community is big. You can find extension easy on internet or marketplace magento marketplace. Also, we provide extension for upgrade magento, export/import, seo, payment, shipment, sales...