Archive grade will last longer than bargain basement purchased CD's and DVD's.
You'll get longer lasting archival storage on DVD than CD to be certain.
The new double side DVD's apparently offer superior archival properties.
It's really a dogs breakfast of opinions on what is the best format to use.
Personally I buy large hard drives when they're on sale..and just load them full of photo's...(I shot raw format so it doesn't take long to fill up a drive)...and just store them with a contact sheet. At least I know the drives will last longer.
I have the same shots backed up on DVD's as well.
It's best to back up wanted material in 2 foramts just in case.