iCloud since I’ve been all in on the Apple ecosystem since … 2004ish (Tiger was a great OS).

Pros:

• Super fast
• Doesn’t need to backup system files
• No limit to # of devices, only storage size
• Reliable
• Restore process is arguably the easiest out of any solution
• Priced fairly (despite people complaining, yeah their free tier is useless)

Cons:

• Only backs up Apple devices.
• Relies on connection speed alone, no shipped hard drive option

If I had to pick a platform agnostic one it’d be Backblaze.

Pros:

• Solid
• Light on resources
• Fairly priced (last I checked) and unlimited is reasonable
• Can do shipped hard drive restores if needed.

Cons:

• Limited backup controls
• Must provide key to decrypt on restore
• Restore process sucks