I was an Android Enthusiast, way back in 2011.
My very first Smartphone was the Android HTC Sensation XE.

Been in the Android Ecosystem for like 4 years.

Then I tried the Apple Ecosystem. I was hooked.
My first iphone was the iphone 5.

Couple of reasons why I switched to apple:
a.) Apps are more stable
b.) Seamless (if you own more than one apple devices like iPad)
c.) App design language is mostly consistent all throughout. Since I believe apple sets standards that must be strictly followed for it to be approved for publication to the appstore.
d.) This is subjective, but I find the Cameras from iPhone better than it's Android Counterparts, (White balance, Color Saturation), Android phones oftentimes over saturates the color of the photos. (I don't know if this is still existent with the current Android flagships, since I am not really that much updated now with the Android Ecosystem)
e.) And lastly (my weirdest reason, and I am really guilty of it). When I was still on Android, I couldn't stop myself from fiddling with my phones' Operating system. I kept on reflashing ROMs everyday, that even my daily driver was using Custom Rom, and for those who are familiar with the said scenario, bugs might occur with the said Custom ROM, rendering your phone useless til you flash a stable ROM. And it takes considerable amount of time for the process to be fully done, since you need to redownload or reinstall the apps that you really need, plus restore backups (messages, photos etc). So yeah, I am keeping myself from buying another Android Device , because for sure, the cycle will repeat.

But I have to admit, I miss the Android Ecosystem. There are stuffs that are way easier to in Android than Apple does. like the ffg.
a.) Transferring Music from PC to Phone (I hate itunes!)
b.) Downloading files from the browser (Apple has closed ecosystem, Android has File manager)

Bottomline, it doesn't matter which Ecosystem/platform you choose, what's important is, pick the one that suffices to your needs. I liked the Apple Ecosystem, because of its simplicity. (Maybe I am just getting old, 26 years old, that's why I prefer things that are simple but does the job just fine).