1- Premium ads Slider: Its Work with PayPal, User must need to pay for this,
2- Featured Ads Slider: Mostly user dont know about PayPal Sandbox or PayPal Business account, That's why we have option for featured ads Slider, If you don't want to use Premium ads then you can use featured ads, And You just need to put category name for featured ads and from that category ads will be shown on Featured Ads Slider.
Thanks