Android is generally more popular in Europe.

The reason is how messaging works. In the US (and Canada?), SMS was affordable since before smartphones, and people kept using SMS once smartphones became common. Apple automatically integrated iMessage into that. Americans are used to texting using the default messaging app, and using an iPhone to text another iPhone provided a better experience than plain old SMS/MMS.

In Europe, SMS was extremely expensive in the late 2000s/early 2010s, so people never really used it, and instead started using cross-platform internet messengers. MSN, Skype, then WhatsApp. Android was/is seen as the same or better quality for a lower price, so why buy an iPhone?