Kappa will stain after a while Aludibond will be stable for a much longer period.
Plasticfoam is made of Polymers that are not stable over long peiods of time. Light and Oxygen and Ozone degenerate them.
interesting - the inner part of Kappa or Centa is the same urethane as between the alu foils of the dibond
Natuaral fabric like unbleached cotton from Hahnemühle will last forever practically and you can print directly on their Canvasses or on Photorag. Later you can still mount these materials to Aludibond.
why paying for a super flat surface of aluminium, if the print surface is cotton? cotton has to be stretched not laminated
coming back to the Kappa options: the self adhesives of these series will not keep strong paper, f.e. aquarell paper with is own sense of direction, strong card board of which the elongination factor regarding humidity is strongly different and not keep any textiles for long, especially if they contain wax or surface treatment
you can mount thin paper, silk, pictures printed on paper below 200gr, otherwise you have to take the uncoated ones and add your own glue f.e. Planatol paper mount acid free
in the thermo vaccum press you can easily use mdf board, beeing as flat as dibond, but cheaper than card board - from 3mm - 10mm
By using the adhesive foil, you separate the picture and the non acid free MDF, it is not necessary, like f.e. using cheap frames ( Ikea or Nielsen, etc.) to put in an acid free paper as a blocker
MDF and Centa are optional available with black cernel, so you do not need to paint the outside, if you hang it unframed - an unpayable advantage if you are in a hurry