The main pro of silicon (vs medpor) is that it's easy to remove and you don't get a significant scar capsule. I consulted 3 docs before my chin implant and they all used silicon and wouldn't touch medpor as tissue grows into it and it's really hard to remove. However medpor looks aesthetically better in some places eg. jaw angles
If gore-tex would make a silicone implant form more of a capsule or make it trickier to remove then I don't see the point tbh. What are the advantages of a PTFE coating?