I'm using the 2TB iCloud plan, because my eco system is apple & apples approach to respecting privacy sits well with me, not fond of google, M$, etc doing lord knows what with your data.
It's my cloud place I run my business off, all my documents etc, obviously backs up my iPhone pics/memories (I tend to do most of my own lifes photos on my phone), although I'm a full time photographer.
I just like how it just works well, I find other services a little bit of a faff.
I do use backblaze for my business's file back up however as that's unlimited data backup.