The TDRC stuff is polyurethane. Chief carries Polyvinyl in addition to the rest except polyurethane.
The nice thing about Polyurethane is that it's fairly rigid, and seats over barbs very well (especially if you heat it up a little bit), I like it as the vent/in tank/to carb... I don't like it for fueling lines because they are hard to remove from a barb. Fairly cheap, so it's nice for the fuel cans.
Tygon usually has a pretty thick and less rigid, I like it for my fueling fittings, although it does deteriorate over time, and little pieces of it end up in the fuel tank from fuel line barbs.
Viton (Sullivan Pro-Flex basically), is hard to get the right wall diameter when buying in bulk so it wont collapse when bent, it's holds up the best, but is less rigid than the rest of them and is the most expensive. PSP sells the right Viton size. I think Viton is great for fueling lines (fuel barbs don't grab chunks like is can with Tygon), smoke, and inside tank lines (supported if you must). Obvious disadvantage being it is not transparent and the price.