Best cloud backup

Hi everyone!
I’m looking for some advice on cloud storage.
Right now I keep all my files on a WD Passport external hard drive. It’s convenient since I can access everything when I need it but I’m starting to worry that it’s not the most reliable long-term solution.
I’d like to back everything up to the cloud and I’m trying to choose the best service. I’m mainly looking for something secure, reliable, reasonably priced and easy to access when needed.
I’ve been looking at Google Drive and Microsoft OneDrive, but I’m open to other suggestions too. Are there any key things I should consider when choosing a cloud service?
I’d really appreciate any recommendations or insights.