There are a variety of cloud options out there and various providers will have their fans. However would say I am pretty happy with One Drive and agree that Microsot generally are held in high regard in terms of security/encryption. I think though it can be beneficial to have a few back up options and I only use Google Drive, have not used DropBox for a while.
Of course to an extent depends on needs and budget. A review of the best providers here https://www.techadvisor.co.uk/test-centre/internet/best-cloud-storage
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
My Device- S21 Ultra 5G ( SM-998B/DS ) CSC= BTU , 12GB/256GB
One Ui 5.0,Android 13 .
I use Samsung Notes. I see no other sync option except for Microsoft. Please tell me that I'm overlooking something. I will NOT use Microsoft.