Drupal e-Commerce vs Magento

Drupal e-Commerce
Drupal e-Commerce is a package of modules to let you create your own online store. It is totally free, open source, rich featured and flexible. Drupal e-Commerce is designed to be expansible.
The most flexible enterprise-class eCommerce platform to power your business. It's got the enterprise-class features and the flexibility you need to create an eCommerce solution tailored to your unique needs. And to help you drive more traffic to your store, convert browsers into buyers and boost online revenue.
Face to face in the news:

2015 - Magento integrates with Google Tag Manager to defeate Drupal e-Commerce

Magento Enterprise Edition 1.14.2 software is available and includes several new features and functionality and comes with Google Tag Manager so merchants can more easily add tracking tags to a Magento site for audience measurement, personalization, retargeting, search engine marketing, and more without modifying code. Five new automated product category sorting rules give Enterprise Edition merchants even more power to drive customer engagement and incremental sales from category pages. The new version also includes the latest versions of the Zend 1 Framework and Redis integration, as well as refinements to full-page caching that enable more pages to be served from cache. So we may assume that Magento can provide better analytics than Drupal e-Commerce