I host my own instance with Masto.host. (@gadgetboy@gadgetboy.social)
I don’t need to be concerned with the Threads drama or worry about people defederating it - I’m in control.
As for best client, I personally love Mona. It runs on my iPhone, iPad, and Mac and perfectly syncs my position in the timeline across devices. Lots of other great features, too.
Samsung hardware is generally pretty solid, so I’m not surprised - but are you still getting OS and security updates? That’s the real downside of Android (at least to me).
The ecosystem. (For better or worse.)
I prefer Android but the ability to do things such as use my AirPods on multiple Macs, iPhones, and iPads is very convenient. Ditto for things like Apple TV and HomeKit (though I use Home Assistant to control my HomeKit devices).
Other things:
Hardware has a longer useful life (Android phone manufacturers “commit” to n years of updates, but the timing of releases is slow and usually limited to 3 years, at most.) There are still iPhone 6 devices in the wild running the latest version of iOS.
Standardized hardware and consistently updated software results in more and better apps.
In short: iPhone is an appliance but an Android smartphone is/can be a pocket computer with greater flexibility.
YMMV
EDIT: Also, my wife and kids use iPhone. When I used an Android phone, I had them all install signal so we communicate securely. With iPhone, that’s built in.
iPhone 6 updates ended with iOS 15. Still, that’s a pretty good run. Unfortunately, you can’t root an iPhone and install a custom ROM like you can with Android.