Not just both. If we've got to open up science class to things that scientists disagree with, then perhaps the old Stalinist Michurianism as promoted by Lysenko should be taught.
Most conservatives are not seen as "open minded", yet you seem to insist that science be open minded about a faith based idea. Why is that?
Those are fightin' words on this forum . . .
Sorry, if you are looking for an argument as many seem to be, I'm not one of them. Don't make suppositions that I'm "insisting" anything. I don't think that ID is an "alternative" equal to evolution in a scientific sense because it is more faith based than anything. I have no problems with briefly mentioning that some people believe in ID. However, I don't think it should be more than briefly. I don't think there should be a whole class built around it.
As for being open-minded. I seem to be one of the few here that doesn't have any problem with either ID or evolution. Even though I'm strongly in the creationist camp, I can respect and learn from the opinions of evolutionists. I don't disregard science at all either and have stated that many times here.