Wrong. According to the companies who pay for iOS and Android exploits in other to make tools like Pegasus, they say it is far harder to get a working android exploit than it is too get a working iOS exploit and as a result they pay more for Android exploits because ios exploits are far more common.

Why is this? Because Google has an Android security team that actively seeks exploits and patches them and Google also invites people to Hackathons and pays them for exploits.

Android is now harder than iOS.

https://www.wired.com/story/android-zero-day-more-than-ios-zerodium/