Mainly from comments I’ve read, I have no first hand experience with a Samsung phone since I brought the S4 and I hated the software. I’ve seen comments from people saying that Samsung installs a lot of bloatware on the devices and random ads.
Security is also an issue for me, I want to be able to install an app and know that it will not contain a virus or have anything like that. I think over the years I have been spoilt by Apple’s ecosystem and I’m very much entrenched in it, as much as I want to try other things, I personally take a look and think “yea but it isn’t Apple so will it be as good“
I've never experienced random ads, I've read comments saying.. that Samsung has done that through the Notification Center or through the LockScreen, but it's never happened to me. Bloatware? Yeah.. lots of Android phones do it. But Samsung has provided ways to either disable them or hide apps (some you can uninstall). I would prefer them to keep it vanilla and not give us any of their apps on Android, but I get their perspective... Apple does it too. And, I know... I know, you can uninstall Apple apps.
And Google has done well with security through the Google Play Store, I don't think that should be a huge concern in regards to containing a virus or anything like that. Obviously, you can side load apps... but I can count on one hand the times that I've done so. And, it's never been any issue... well, as far as I know. I like the fact I'm on two sides of the camp. I get the iOS/iPadOS experience with my iPad and the whole Android experience with Samsung. And I gotta acknowledge Samsung has done well with providing a good Android experience.