Magento is in secure control of the world’s top 10-thousand and 1 million websites sites, with 14500 websites in the Alexa top 1 million websites
The sites you find in the top 10K are websites like Zulily.com that gets over 34 Million visits per month requires a specific eCommerce solution that is very resource intensive, in this case that platform is Magento
At the other end of the spectrum you find a website like dailysteals.com whose monthly visits are around 1.6M. This is significantly less in comparison to zulily's even though they are both shopping websites. Their monthly visits reflect the eCommerce platform they use, Shopify. Despite Shopify becoming more scalable the platform is still viewed as a solution for your "mom and pop" sort of business'.
The vast majority of Magento 1x online shops sell clothing products and accessories, where Magento 2x stores sell electronics, computers, footwear, toys, cosmetics among showing a mixed picture with no obvious dominant market segment.
Magento 2x continues to win over businesses that recognise the flexibility and powerful features with around 11000 Magento 2 stores switching from WooCommerce.