I enjoyed using vegetable based parchment because we were being lazy and pouring our collection, straight onto the parchment. But we found that the vegetable based is thinner than usual and cannot be used for large yeilds.. still my favorite out of anything I've tried thats: -Not leaching -Doesn't seep through the paper -Possible to pour AND purge on -Has great nonstick capabilites when storing slabs http://www.amazon.com/Baar-8540-Patapar-Paper/dp/B001YIRZ28

This is one of the better deals I found for the paperchef rolls just now: http://www.amazon.com/PaperChef-Culinary-Parchment-15-Inch-98-4-Feet/dp/B008FIUUX6

These are some others I found that are silicon coated. To be honest I haven't found other vegi based papers without silicon other than Pataper.

http://www.amazon.com/Beyond-Gourmet-Unbleached-Parchment-71-Square/dp/B001KUWGDS

http://www.amazon.com/Regency-Natural-non-Stick-Parchment-Baking/dp/B001GEZ4W8

http://www.amazon.com/If-You-Care-Unbleached-Parchment/dp/B001IZIC8I

Edit: just saw your question about PTFE. Just speaking from experience.. when I ordered this roll from amazon, their was only 10-15feet on it.. when theirs supposed to be like 46 ft... PTFE is great if your just storing stable concentrates on it. But it's a thin plastic that bends if you pull it to hard and sticky concentrates aren't easy separating, even when frozen... Just my 2 cents