Asking "do you agree with my opinion X" feels good in the moment: the other person is more likely to agree, as agreeing feels good.

Asking "what do you think" without pre-supplying your take is riskier. But it's worth it, because you get more information, which is far more valuable than feeling good in the moment.

The first is the definition of a leading question

I always thought the Mom Test was a startup 101 book-length-article for people who never read business lit

Apparently I was wrong?

Both of them are leading. The second question is literally the first example of a “awful question” in the book The Mom Test.