If I could choose again, I would go with the oem type material. The stainless is much harder and didn't sickfish member have a problems with leakage? Atleast in water hydraulics (also stainless tubes), it is very hard to get the pipe connectors to seat well enough so that the connection won't leak.
Also, if the pre-bends are slightly off, the oem material is much easier to correct. If the car is kept good and not driven in snow & salt I would guess that the lines will last longer than the owner. So now when I have installed mine, I think that the stainless lines are way overkill.