It should also be noted that the #1 vector for malware installation on Android is the Play Store itself[3].
The issue isn't Apple or Google's mobile app distribution implementations themselves. The issue is that the app store model was only adopted because of its profitability, and security was an afterthought. Despite this, the companies' PR departments try to paint the app store model as necessary for "security" and then fall short of actually securing things because that might cost money or decrease revenue. There's no competition, so who is going to stop them or force them to improve?
[1] https://www.theregister.com/2020/05/14/zerodium_ios_flaws/
[2] http://zerodium.com/program.html
[3] https://www.zdnet.com/article/play-store-identified-as-main-...