this should probably be in comics, but:

[Mike P]

I didn't avoid the question. I said that Magneto's sphere would give first.

Well, what kind of adamantium is it? Is it true adamantium or secondary adamantium? Second of all, where is Magneto getting all of this adamantium? It's a man-made metal, and extremely expensive to produce.

I think, in any case, Superman would be able to break out of the adamantium sphere before he suffered a loss of power. Not only that, but with the use of his various vision powers (namely microscopic and heat) he would be able to manipulate the adamantium and escape the sphere.

So you're not confused, Spooky: Magneto would give first.