One thing that you may have to decide with refurbished is whether to buy with all original brand replacements or cheaper third party.
I decided third party rather than all Samsung refurbished parts.
You don't know what has been changed anyway. Screen, camera glass, & battery are most likely?
(It a bit like buying a used car. I've never checked to see if the tyres are the same brand as the car originally came with from the factory. Anyway I always buy cheaper mid-range tyres, usually made in Turkey)