Hi Isisman,
My dad had a metal stent and from what I understand things, they are intended to be placed permanently. His CC was inoperable so no surgery was going to happen so he had the metal stent. Plastic stents can be changed and they last around 3 months or so before they will clog up. Metal stents can still clog but they can last for a year or so before that happens. I think that metal stents can still be unclogged if they clog up but they will not be removed. I think another tube can be inserted into a clogged metal one to unclog it, whereas a plastic one will be changed.
As to which one is better, I’m not sure. I guess it would depend on the individual. Perhaps someone else can help with this. Hope some of that is useful.
Best wishes,
Gavin