All packages are distributed around the world by a blazing fast global Content Delivery Network (CDN). Let us take off the pressure of having to manage and maintain Enterprise-level software distribution.
Private/internal repositories limit package access to authorised clients and users, without sharing packages to the world. If you need internal software distribution mechanics, or if you want to support license-based software distribution, then private repositories facilitates these.
The priority upload queue has higher precedence than the non-priority upload queues, and more processing power. When on the priority upload queue your packages will be processed quicker, and will have priority over other packages.