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

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

How “what do you think” is leading? I get that it is general, but I don’t see how is it leading?

Here is the excerpt from the book which I would highly recommend you read if you want to learn how to ask good questions. The book categorizes this type of question as awful.   

“Opinions are worthless”

I’m here to make friends.
Orchestrator of Dash Platform developments @DashCoreGroup.
Self-proclaimed CEO (Chief Ethics Officer) of degens.

Thanks for the excerpt! I read the book previously. I argue that “Do you think it’s a good idea?” and “What do you think?” are different questions. It ain’t the same leage. “Wdyt?” though is not the best, but not leading.

Google “the mom test pdf” and go to the examples section. The book does a very thorough job of explaining it.