Not sure that's valid; in my experience Samsung phones are fairly repairable* and have spare parts available worldwide. Guessing Fairphone parts are much more limited.
* probably much more fiddly than a fairphone though
Can't speak to availability outside of Europe, but parts are sold by the manufacturer directly for fairphone, so they're very easy to get hold of if you can buy a fairphone in the first place.
Me saying "a samsung" probably isn't helpful since different models vary. Here's some ratings and detail of repairing major smartphone models though if you're interested: https://www.ifixit.com/repairability/smartphone-repairabilit...