Personally I am not convienced of the longativity of inkjet prints. In the past I have tried every combination of ink / paper you can think of, including all the most expensive ones and supposedly best.
I've used various coatings as well.
And within 3 -5 years I think every single one has started to degrade in one way or another. More importantly I've had customer complaints.
Now I only use professional labs, proper traditional prints, and high commercial grade printers for large formats.
The difference is plain to see, not only is the quality better in the first place, I have seen no issues with longetivity.
Actually as I write this, I'll retract one part of the above statement. Inkjets on canvas seem to be fine. But everything else no.
Paul.
www.photographybyriddell.co.uk