I would say you are wrong. I have used both and the experience was always worse compared to that of competitors, despite their advantage of
a) deep hardware integration
b) deep platform integration (so much, that it feels like effort is required to not use the services).
I guess it depends on what your bar is for “better than terrible”, but when I look at the richest company in tech that also happens to own the entire stack in play, then “better than terrible” is not remotely good enough.
Apple Music is my favorite. I like being able to buy things not included in streaming on iTunes or rip music from other sources and have it integrate into the ui. Last time I checked spotify is missing a clean way to integrate music it's streaming service is missing.
iCloud seems to be on par or better than one drive. I'm not sure who else is it's competitor. Dropbox has better syncing with multiple users and g-suite has better online editing and sharing tools. Their core stories is different than iCloud's, which is a online backup of personal documents. Maybe Google Drive has good desktop apps and works for Android users.
Yeah because Samsung is known for a free and open platform. Honestly I bought an S8+ in March and I don't think I'll be getting another Samsung device. They make their own apps for so much there are issues getting their phones to work with things built for Android. I have a car that supports Android Auto and it worked fantastically when I had my Nexus 6p but it has been unreliable and I don't use it anymore thanks to my Samsung device.